stackbuilder - wizard: Allow keyboard editting of the download path.

Log Message:
-----------
Allow keyboard editting of the download path.

Modified Files:
--------------
wizard:
DownloadPage.cpp (r1.6 -> r1.7)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/stackbuilder/wizard/DownloadPage.cpp.diff?r1=1.6&r2=1.7)
wizard/include:
DownloadPage.h (r1.4 -> r1.5)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/stackbuilder/wizard/include/DownloadPage.h.diff?r1=1.4&r2=1.5)