pgsql: Fixed parser and library to allow empty database names.

Log Message:
-----------
Fixed parser and library to allow empty database names.
Streamlined connection name parsing.
Added Joachim's patch to shorten paths before diffing.

Modified Files:
--------------
pgsql/src/interfaces/ecpg:
ChangeLog (r1.330 -> r1.331)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ChangeLog.diff?r1=1.330&r2=1.331)
pgsql/src/interfaces/ecpg/ecpglib:
connect.c (r1.34 -> r1.35)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ecpglib/connect.c.diff?r1=1.34&r2=1.35)
pgsql/src/interfaces/ecpg/preproc:
preproc.y (r1.333 -> r1.334)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/preproc.y.diff?r1=1.333&r2=1.334)
pgsql/src/interfaces/ecpg/test:
pg_regress.sh (r1.7 -> r1.8)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/pg_regress.sh.diff?r1=1.7&r2=1.8)
pgsql/src/interfaces/ecpg/test/connect:
test1.pgc.in (r1.2 -> r1.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/connect/test1.pgc.in.diff?r1=1.2&r2=1.3)
test5.pgc (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/connect/test5.pgc.diff?r1=1.1&r2=1.2)
pgsql/src/interfaces/ecpg/test/expected:
compat_informix-dec_test.c (r1.4 -> r1.5)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/compat_informix-dec_test.c.diff?r1=1.4&r2=1.5)
compat_informix-rnull.c (r1.3 -> r1.4)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/compat_informix-rnull.c.diff?r1=1.3&r2=1.4)
compat_informix-test_informix.c (r1.3 -> r1.4)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/compat_informix-test_informix.c.diff?r1=1.3&r2=1.4)
compat_informix-test_informix2.c (r1.4 -> r1.5)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/compat_informix-test_informix2.c.diff?r1=1.4&r2=1.5)
complex-test1.c (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/complex-test1.c.diff?r1=1.1&r2=1.2)
complex-test2.c (r1.2 -> r1.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/complex-test2.c.diff?r1=1.2&r2=1.3)
complex-test3.c (r1.2 -> r1.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/complex-test3.c.diff?r1=1.2&r2=1.3)
complex-test4.c (r1.3 -> r1.4)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/complex-test4.c.diff?r1=1.3&r2=1.4)
complex-test5.c (r1.3 -> r1.4)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/complex-test5.c.diff?r1=1.3&r2=1.4)
connect-test1.c (r1.3 -> r1.4)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/connect-test1.c.diff?r1=1.3&r2=1.4)
connect-test1.stderr (r1.3 -> r1.4)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/connect-test1.stderr.diff?r1=1.3&r2=1.4)
connect-test2.c (r1.2 -> r1.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/connect-test2.c.diff?r1=1.2&r2=1.3)
connect-test3.c (r1.3 -> r1.4)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/connect-test3.c.diff?r1=1.3&r2=1.4)
connect-test4.c (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/connect-test4.c.diff?r1=1.1&r2=1.2)
connect-test5.c (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/connect-test5.c.diff?r1=1.1&r2=1.2)
connect-test5.stderr (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/connect-test5.stderr.diff?r1=1.1&r2=1.2)
errors-init.c (r1.4 -> r1.5)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/errors-init.c.diff?r1=1.4&r2=1.5)
pgtypeslib-dt_test.c (r1.5 -> r1.6)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/pgtypeslib-dt_test.c.diff?r1=1.5&r2=1.6)
pgtypeslib-dt_test2.c (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/pgtypeslib-dt_test2.c.diff?r1=1.1&r2=1.2)
pgtypeslib-num_test.c (r1.3 -> r1.4)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/pgtypeslib-num_test.c.diff?r1=1.3&r2=1.4)
pgtypeslib-num_test2.c (r1.6 -> r1.7)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/pgtypeslib-num_test2.c.diff?r1=1.6&r2=1.7)
sql-code100.c (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/sql-code100.c.diff?r1=1.1&r2=1.2)
sql-copystdout.c (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/sql-copystdout.c.diff?r1=1.1&r2=1.2)
sql-define.c (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/sql-define.c.diff?r1=1.1&r2=1.2)
sql-desc.c (r1.5 -> r1.6)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/sql-desc.c.diff?r1=1.5&r2=1.6)
sql-dynalloc.c (r1.3 -> r1.4)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/sql-dynalloc.c.diff?r1=1.3&r2=1.4)
sql-dynalloc2.c (r1.2 -> r1.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/sql-dynalloc2.c.diff?r1=1.2&r2=1.3)
sql-dyntest.c (r1.5 -> r1.6)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/sql-dyntest.c.diff?r1=1.5&r2=1.6)
sql-func.c (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/sql-func.c.diff?r1=1.1&r2=1.2)
sql-indicators.c (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/sql-indicators.c.diff?r1=1.1&r2=1.2)
sql-quote.c (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/sql-quote.c.diff?r1=1.1&r2=1.2)
sql-show.c (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/sql-show.c.diff?r1=1.1&r2=1.2)
thread-thread.c (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/thread-thread.c.diff?r1=1.1&r2=1.2)
thread-thread_implicit.c (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/thread-thread_implicit.c.diff?r1=1.1&r2=1.2)