Log Message:
-----------
Code review for contrib/pg_freespacemap. Add a storedpages column to
pg_freespacemap_relations --- while one could theoretically get that
number by counting rows in pg_freespacemap_pages, it's surely the hard
way to do it. Avoid expensive and inconvenient conversion to and from
text format. Minor code and docs cleanup.

Modified Files:
--------------
pgsql/contrib/pg_freespacemap:
README.pg_freespacemap (r1.3 -> r1.4)
(http://developer.postgresql.org/cvsw...?r1=1.3&r2=1.4)
pg_freespacemap.c (r1.4 -> r1.5)
(http://developer.postgresql.org/cvsw...?r1=1.4&r2=1.5)
pg_freespacemap.sql.in (r1.4 -> r1.5)
(http://developer.postgresql.org/cvsw...?r1=1.4&r2=1.5)

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TIP 5: don't forget to increase your free space map settings