CAINT-1332: Fixing error with the GUI upgrader due to circular property reference.
CAINT-1329: Fixing GUI installer to properly install on Windows 7 by upgrading to izpack 4.3.5 and making sure the selected installation directory is being used as the INSTALLATION_PATH by izpack.
Merging the two installer releated fixes back to the development branch. They'll be included in the next release.