pgstatsinfo - pg_statsinfo: Cleanup statsrepo schema and bugfix.

Log Message:
-----------
Cleanup statsrepo schema and bugfix.
- Add index_scans for statsrepo.autovacuum.
- Rename statsrepo.user to statsrepo.role.
- Add spcoptions for tablespace.
- Change char to "char" in statsrepo.
- Add reltuples to table and index snapshots.
- Add relam to index snapshots.
- Split "fullname" in autovacuum and autoanalyze to "database", "schema", and "table".
- Need to restore errno because close() might change the code.

Modified Files:
--------------
pg_statsinfo/bin:
autovacuum.c (r1.8 -> r1.9)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/autovacuum.c?r1=1.8&r2=1.9)
checkpoint.c (r1.8 -> r1.9)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/checkpoint.c?r1=1.8&r2=1.9)
collector_sql.h (r1.11 -> r1.12)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/collector_sql.h?r1=1.11&r2=1.12)
pg_statsrepo.sql (r1.7 -> r1.8)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/pg_statsrepo.sql?r1=1.7&r2=1.8)
snapshot.c (r1.14 -> r1.15)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/snapshot.c?r1=1.14&r2=1.15)
writer_sql.h (r1.5 -> r1.6)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/writer_sql.h?r1=1.5&r2=1.6)
pg_statsinfo/lib:
libstatsinfo.c (r1.18 -> r1.19)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/lib/libstatsinfo.c?r1=1.18&r2=1.19)
pg_statsinfo.sql.in (r1.6 -> r1.7)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/lib/pg_statsinfo.sql.in?r1=1.6&r2=1.7)