updated version info, displaying protocol version in node

git-svn-id: svn://localhost/project_picapica/trunk@234 fb96df88-216d-11de-830c-f3023f12d8ac
notifications in MainWindow, show-hide on button click

git-svn-id: svn://localhost/project_picapica/trunk@235 fb96df88-216d-11de-830c-f3023f12d8ac
notifications about protocol version incompatibility implemented

git-svn-id: svn://localhost/project_picapica/trunk@236 fb96df88-216d-11de-830c-f3023f12d8ac