Small improvements to avoid trains blocked at signals:
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waiting points within clearingDistanceM moved outside such zone;
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improved track reservation management when train is created over a track reserved by other train;
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avoided continuous passing from braking to stop for trains stopped in front of signal.
git-svn-id: http://svn.uktrainsim.com/svn/openrails/trunk@2693 a9f3cfff-6c41-7446-b0ca-052bd761e6eb