Register ".geany" as Geany Project File extension.
Show a checkbox to open the Release Notes at the end of the installation.
When the installer is executed without admin privileges, install Geany only for the user. Otherwise, install Geany for All Users.
Fix problems with automatic uninstallation at startup of the installation when the installation directory were different.
Install GTK translation files only if installation of translation files were requested (saves about 22 MB otherwise).

git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@3475 ea778897-0a13-0410-b9d1-a72fbfd435f5