Errors in waiting point processing for AI corrected.
Errors in reversal point processing corrected.
Added processing for stations which have gone 'off route' due to alternative path selection (for AI only).
git-svn-id: http://svn.uktrainsim.com/svn/openrails/trunk@1580 a9f3cfff-6c41-7446-b0ca-052bd761e6eb