pgstatsinfo - pg_statsinfo: - Previously, pg_statsinfo did not delete

Log Message:
-----------
- Previously, pg_statsinfo did not delete autovacuum log files that store
information about DBs that not monitoring target. So, these files were
left derelict. Now pg_statsinfo deletes these files on getting snapshot.

Modified Files:
--------------
pg_statsinfo/pg_statsinfo/stats_info:
stats_info.c (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/pg_statsinfo/stats_info/stats_info.c?r1=1.2&r2=1.3)
stats_info.sql.in (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/pg_statsinfo/stats_info/stats_info.sql.in?r1=1.2&r2=1.3)
stats_info_sql.h (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/pg_statsinfo/stats_info/stats_info_sql.h?r1=1.2&r2=1.3)
uninstall_stats_info.sql (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/pg_statsinfo/stats_info/uninstall_stats_info.sql?r1=1.2&r2=1.3)