pg-migrator - src: Add TODO items.

Log Message:
-----------
Add TODO items.

Restructure code.

Add suggestion to run 'vacuumdb -all --analyze' to restore statistics
and free space information.

Modified Files:
--------------
    src:
        README (r1.5 -> r1.6)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pg-migrator/src/README.diff?r1=1.5&r2=1.6)
        TODO (r1.22 -> r1.23)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pg-migrator/src/TODO.diff?r1=1.22&r2=1.23)
        pg_migrator.c (r1.60 -> r1.61)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pg-migrator/src/pg_migrator.c.diff?r1=1.60&r2=1.61)
        pg_migrator.h (r1.8 -> r1.9)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pg-migrator/src/pg_migrator.h.diff?r1=1.8&r2=1.9)
        relfilenode.c (r1.6 -> r1.7)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pg-migrator/src/relfilenode.c.diff?r1=1.6&r2=1.7)