pgsql: Change the reloptions machinery to use a table-based parser, and

Log Message:
-----------
Change the reloptions machinery to use a table-based parser, and provide
a more complete framework for writing custom option processing routines
by user-defined access methods.

Catalog version bumped due to the general API changes, which are going to
affect user-defined "amoptions" routines.

Modified Files:
--------------
pgsql/src/backend/access/common:
reloptions.c (r1.12 -> r1.13)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/common/reloptions.c?r1=1.12&r2=1.13)
pgsql/src/backend/access/gin:
ginutil.c (r1.19 -> r1.20)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/gin/ginutil.c?r1=1.19&r2=1.20)
pgsql/src/backend/access/gist:
gistutil.c (r1.32 -> r1.33)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/gist/gistutil.c?r1=1.32&r2=1.33)
pgsql/src/backend/access/hash:
hashutil.c (r1.58 -> r1.59)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/hash/hashutil.c?r1=1.58&r2=1.59)
pgsql/src/backend/access/nbtree:
nbtutils.c (r1.92 -> r1.93)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/nbtree/nbtutils.c?r1=1.92&r2=1.93)
pgsql/src/include/access:
reloptions.h (r1.6 -> r1.7)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/access/reloptions.h?r1=1.6&r2=1.7)
pgsql/src/include/catalog:
catversion.h (r1.516 -> r1.517)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/catversion.h?r1=1.516&r2=1.517)