pgstatspack - pgstatspack: add table size + index size, pg version

Log Message:
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add table size + index size, pg version retrieval, pgstatspack_statements

Modified Files:
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pgstatspack/sql:
pgstatspack_create_snap.sql (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatspack/pgstatspack/sql/pgstatspack_create_snap.sql?r1=1.1&r2=1.2)