pgsql-server: - Fixed indicator in SET DESCRIPTOR.

Log Message:
-----------
- Fixed indicator in SET DESCRIPTOR.
- Added special handling of descriptor header information.
- Some code cleanup.

Modified Files:
--------------
pgsql-server/src/interfaces/ecpg:
ChangeLog (r1.271 -> r1.272)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/interfaces/ecpg/ChangeLog.diff?r1=1.271&r2=1.272)
pgsql-server/src/interfaces/ecpg/ecpglib:
descriptor.c (r1.10 -> r1.11)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/interfaces/ecpg/ecpglib/descriptor.c.diff?r1=1.10&r2=1.11)
execute.c (r1.36 -> r1.37)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/interfaces/ecpg/ecpglib/execute.c.diff?r1=1.36&r2=1.37)
pgsql-server/src/interfaces/ecpg/include:
ecpglib.h (r1.62 -> r1.63)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/interfaces/ecpg/include/ecpglib.h.diff?r1=1.62&r2=1.63)
pgsql-server/src/interfaces/ecpg/preproc:
descriptor.c (r1.20 -> r1.21)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/interfaces/ecpg/preproc/descriptor.c.diff?r1=1.20&r2=1.21)
preproc.y (r1.291 -> r1.292)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/interfaces/ecpg/preproc/preproc.y.diff?r1=1.291&r2=1.292)
pgsql-server/src/interfaces/ecpg/test:
test_desc.pgc (r1.2 -> r1.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/interfaces/ecpg/test/test_desc.pgc.diff?r1=1.2&r2=1.3)