General error message improvement: all dialogs should now be labelled as "Open Rails" and non-menu dialogs should include the version number too. Also updated the RunActivity error when no arguments are passed.
Fix debugging issue accidentally added in X1919.
git-svn-id: http://svn.uktrainsim.com/svn/openrails/trunk@1920 a9f3cfff-6c41-7446-b0ca-052bd761e6eb