pginstaller - pginst: Add Slony-I support.

Log Message:
-----------
Add Slony-I support.

Modified Files:
--------------
    pginst/lang:
        de_welcome.rtf (r1.5 -> r1.6)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/lang/de_welcome.rtf.diff?r1=1.5&r2=1.6)
        fr_welcome.rtf (r1.3 -> r1.4)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/lang/fr_welcome.rtf.diff?r1=1.3&r2=1.4)
        pt_br_welcome.rtf (r1.5 -> r1.6)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/lang/pt_br_welcome.rtf.diff?r1=1.5&r2=1.6)
        ru_welcome.rtf (r1.5 -> r1.6)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/lang/ru_welcome.rtf.diff?r1=1.5&r2=1.6)
        tr_welcome.rtf (r1.2 -> r1.3)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/lang/tr_welcome.rtf.diff?r1=1.2&r2=1.3)
    pginst/txt:
        welcome.rtf (r1.17 -> r1.18)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/txt/welcome.rtf.diff?r1=1.17&r2=1.18)
    pginst/wxs:
        pginst.wxs (r1.157 -> r1.158)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/wxs/pginst.wxs.diff?r1=1.157&r2=1.158)