Remove unnecessary code

git-svn-id: http://cantata.googlecode.com/svn/trunk@5211 b1e49159-3266-923f-9c3e-04f16369770a
Improve AboutPage

git-svn-id: http://cantata.googlecode.com/svn/trunk@5212 b1e49159-3266-923f-9c3e-04f16369770a