pginstaller - pginst: Provide information and button to subscribe to

Log Message:
-----------
Provide information and button to subscribe to pgsql-announce, per
http://pgfoundry.org/tracker/index.php?func=detail&aid=1000084&group_id=1000007&atid=129

Modified Files:
--------------
    pginst/ca:
        Makefile (r1.7 -> r1.8)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/ca/Makefile.diff?r1=1.7&r2=1.8)
        pginstca.c (r1.35 -> r1.36)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/ca/pginstca.c.diff?r1=1.35&r2=1.36)
    pginst/wxs:
        dialogs.wxs (r1.20 -> r1.21)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/wxs/dialogs.wxs.diff?r1=1.20&r2=1.21)
        pginst.wxs (r1.52 -> r1.53)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/wxs/pginst.wxs.diff?r1=1.52&r2=1.53)