stackbuilder - wizard: Store proxy settings on *nix

Log Message:
-----------
Store proxy settings on *nix

Modified Files:
--------------
wizard:
IntroductionPage.cpp (r1.13 -> r1.14)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/stackbuilder/wizard/IntroductionPage.cpp.diff?r1=1.13&r2=1.14)
ProxyDialog.cpp (r1.4 -> r1.5)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/stackbuilder/wizard/ProxyDialog.cpp.diff?r1=1.4&r2=1.5)