pgsql: 1.

Log Message:
-----------
1. full functional WAL for GiST
2. improve vacuum for gist
- use FSM
- full vacuum:
- reforms parent tuple if it's needed
( tuples was deleted on child page or parent tuple remains invalid
after crash recovery )
- truncate index file if possible
3. fixes bugs and mistakes

Modified Files:
--------------
pgsql/src/backend/access/gist:
Makefile (r1.13 -> r1.14)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/gist/Makefile.diff?r1=1.13&r2=1.14)
gist.c (r1.119 -> r1.120)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/gist/gist.c.diff?r1=1.119&r2=1.120)
gistget.c (r1.48 -> r1.49)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/gist/gistget.c.diff?r1=1.48&r2=1.49)
gistutil.c (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/gist/gistutil.c.diff?r1=1.1&r2=1.2)
gistxlog.c (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/gist/gistxlog.c.diff?r1=1.1&r2=1.2)
pgsql/src/include/access:
gist.h (r1.46 -> r1.47)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/access/gist.h.diff?r1=1.46&r2=1.47)
gist_private.h (r1.3 -> r1.4)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/access/gist_private.h.diff?r1=1.3&r2=1.4)
pgsql/src/include/catalog:
catversion.h (r1.278 -> r1.279)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/catversion.h.diff?r1=1.278&r2=1.279)
pg_am.h (r1.34 -> r1.35)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_am.h.diff?r1=1.34&r2=1.35)
pg_proc.h (r1.368 -> r1.369)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_proc.h.diff?r1=1.368&r2=1.369)

Added Files:
-----------
pgsql/src/backend/access/gist:
gistvacuum.c (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/gist/gistvacuum.c?rev=1.1&content-type=text/x-cvsweb-markup)