- Removed all usages of the old windows icon (rstray3.png) and used the standard icon of the application
- Added possibility to change the icon of the GxsGroupDialog

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@7471 b45a01b8-16f6-495d-af2f-9b41ad6348cc