pg-migrator - src: Add code to check that pg_controldata values are

Log Message:
-----------
Add code to check that pg_controldata values are compatible between
versions.

Modified Files:
--------------
    src:
        Makefile (r1.7 -> r1.8)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pg-migrator/src/Makefile.diff?r1=1.7&r2=1.8)
        TODO (r1.17 -> r1.18)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pg-migrator/src/TODO.diff?r1=1.17&r2=1.18)
        pg_migrator.c (r1.49 -> r1.50)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pg-migrator/src/pg_migrator.c.diff?r1=1.49&r2=1.50)
        pg_migrator.h (r1.3 -> r1.4)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pg-migrator/src/pg_migrator.h.diff?r1=1.3&r2=1.4)

Added Files:
-----------
    src:
        controldata.c (r1.1)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pg-migrator/src/controldata.c?rev=1.1&content-type=text/x-cvsweb-markup)

Removed Files:
-------------
    src:
        misc.c
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pg-migrator/src/misc.c)