Android: Apply weights to boxes as well as items. We have to update the weights whenever we add or remove something from a box that has already been packed, so adding a private boxUpdate method for doing that. I tried to clean up the existing code somewhat in the process but it caused other layout problems... so I went bare bones with the changes here and it seems to work. Will revisit the streamlining later.

[Desktop Entry]
Name=Dynamic Windows Test
Exec=@prefix@/bin/dwtest 
Terminal=false
MultipleArgs=false
Type=Application
Categories=Application;Development;X-Red-Hat-Base;