Log Message:
-----------
Only present npgsql for installation if the .net framework is installed
Modified Files:
--------------
pginst/wxs:
pginst.wxs (r1.20 -> r1.21)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/wxs/pginst.wxs.diff?r1=1.20&r2=1.21)