pgsql: The attached patch contains a couple of fixes in the existing

Log Message:
-----------
The attached patch contains a couple of fixes in the existing probes and
includes a few new ones.

- Fixed compilation errors on OS X for probes that use typedefs
- Fixed a number of probes to pass ForkNumber per the relation forks
patch
- The new probes are those that were taken out from the previous
submitted patch and required simple fixes. Will submit the other probes
that may require more discussion in a separate patch.

Robert Lor

Modified Files:
--------------
    pgsql/src/backend/access/transam:
        xlog.c (r1.323 -> r1.324)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/transam/xlog.c?r1=1.323&r2=1.324)
    pgsql/src/backend/storage/buffer:
        bufmgr.c (r1.242 -> r1.243)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/buffer/bufmgr.c?r1=1.242&r2=1.243)
    pgsql/src/backend/storage/smgr:
        md.c (r1.141 -> r1.142)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/smgr/md.c?r1=1.141&r2=1.142)
    pgsql/src/backend/utils:
        Gen_dummy_probes.sed (r1.2 -> r1.3)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/Gen_dummy_probes.sed?r1=1.2&r2=1.3)
        probes.d (r1.3 -> r1.4)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/probes.d?r1=1.3&r2=1.4)