pgsql: Code & docs review for server instrumentation patch.

Log Message:
-----------
Code & docs review for server instrumentation patch. File timestamps
should surely be timestamptz not timestamp; fix some but not all of the
holes in check_and_make_absolute(); other minor cleanup. Also put in
the missed catversion bump.

Modified Files:
--------------
pgsql/doc/src/sgml:
func.sgml (r1.278 -> r1.279)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml.diff?r1=1.278&r2=1.279)
pgsql/src/backend/postmaster:
postmaster.c (r1.463 -> r1.464)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/postmaster.c.diff?r1=1.463&r2=1.464)
pgsql/src/backend/utils/adt:
genfile.c (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/genfile.c.diff?r1=1.1&r2=1.2)
misc.c (r1.46 -> r1.47)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/misc.c.diff?r1=1.46&r2=1.47)
timestamp.c (r1.147 -> r1.148)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/timestamp.c.diff?r1=1.147&r2=1.148)
pgsql/src/include/catalog:
catversion.h (r1.296 -> r1.297)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/catversion.h.diff?r1=1.296&r2=1.297)
pg_proc.h (r1.381 -> r1.382)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_proc.h.diff?r1=1.381&r2=1.382)
pgsql/src/include/utils:
timestamp.h (r1.53 -> r1.54)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/utils/timestamp.h.diff?r1=1.53&r2=1.54)