Fix for the code that recorded the most recent saved version that works (for multi-version save compatibility) - it was not correctly recording recent version numbers.
Also a minor tweak to the compatibility warning - the save version doesn't have to always be older.
git-svn-id: http://svn.uktrainsim.com/svn/openrails/trunk@2563 a9f3cfff-6c41-7446-b0ca-052bd761e6eb