pgsql: Convert the lock manager to use the new dynahash.c support for

Log Message:
-----------
Convert the lock manager to use the new dynahash.c support for partitioned
hash tables, instead of the previous kluge involving multiple hash tables.
This partially undoes my patch of last December.

Modified Files:
--------------
pgsql/src/backend/storage/lmgr:
README (r1.19 -> r1.20)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/lmgr/README.diff?r1=1.19&r2=1.20)
deadlock.c (r1.40 -> r1.41)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/lmgr/deadlock.c.diff?r1=1.40&r2=1.41)
lock.c (r1.167 -> r1.168)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/lmgr/lock.c.diff?r1=1.167&r2=1.168)
proc.c (r1.177 -> r1.178)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/lmgr/proc.c.diff?r1=1.177&r2=1.178)
pgsql/src/backend/utils/adt:
lockfuncs.c (r1.23 -> r1.24)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/lockfuncs.c.diff?r1=1.23&r2=1.24)
pgsql/src/include/storage:
lock.h (r1.95 -> r1.96)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/storage/lock.h.diff?r1=1.95&r2=1.96)
lwlock.h (r1.29 -> r1.30)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/storage/lwlock.h.diff?r1=1.29&r2=1.30)