pgstatsinfo - pg_statsinfo: various fixes.

Log Message:
-----------
various fixes.
- Adjust parameter if pg_statsinfo.textlog_filename is empty.
- Fix usage of pg_statsinfo.textlog_permission.
- Avoid postmaster's crash even if statsinfo crashes.

Modified Files:
--------------
pg_statsinfo/bin:
collector.c (r1.9 -> r1.10)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/collector.c?r1=1.9&r2=1.10)
collector_sql.h (r1.5 -> r1.6)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/collector_sql.h?r1=1.5&r2=1.6)
logger.c (r1.11 -> r1.12)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/logger.c?r1=1.11&r2=1.12)
logger_out.c (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/logger_out.c?r1=1.2&r2=1.3)
pg_statsinfo.c (r1.8 -> r1.9)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/pg_statsinfo.c?r1=1.8&r2=1.9)
pg_statsinfo.h (r1.8 -> r1.9)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/pg_statsinfo.h?r1=1.8&r2=1.9)
pg_statsrepo.sql (r1.6 -> r1.7)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/pg_statsrepo.sql?r1=1.6&r2=1.7)
snapshot.c (r1.10 -> r1.11)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/snapshot.c?r1=1.10&r2=1.11)
writer.c (r1.10 -> r1.11)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/writer.c?r1=1.10&r2=1.11)
pg_statsinfo/bin/pgut:
pgut-pthread.c (r1.3 -> r1.4)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/pgut/pgut-pthread.c?r1=1.3&r2=1.4)
pgut.c (r1.6 -> r1.7)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/pgut/pgut.c?r1=1.6&r2=1.7)
pg_statsinfo/lib:
libstatsinfo.c (r1.9 -> r1.10)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/lib/libstatsinfo.c?r1=1.9&r2=1.10)
libstatsinfo.h (r1.4 -> r1.5)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/lib/libstatsinfo.h?r1=1.4&r2=1.5)
pg_statsinfo.sql.in (r1.4 -> r1.5)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/lib/pg_statsinfo.sql.in?r1=1.4&r2=1.5)
port.c (r1.4 -> r1.5)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/lib/port.c?r1=1.4&r2=1.5)
pg_statsinfo/msvc:
bin.vcproj (r1.3 -> r1.4)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/msvc/bin.vcproj?r1=1.3&r2=1.4)
lib.vcproj (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/msvc/lib.vcproj?r1=1.2&r2=1.3)
readme.txt (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/msvc/readme.txt?r1=1.2&r2=1.3)