Delete entrenchments from scenario

[Mobhack]

The rally hex wont work for the initial run from a hex where they recieved a casualty and so pulled back - that is always to what the unit thinks is safer (usually towards their sides map edge).

Also - if the rally hex is further away from the unit than its own map edge, it will tend to go there.

So, the rally hex is really a hint to the unit that its to go toward there - but if it thinks the map edge it should go to is nearer, it will go there. Also - it will sometimes go for the unit command element if it is close. And sometimes it'll initially go towards the enemy - if for example the path to the rear map edge is quicker that way (avoiding woods etc). Sometimes it will just sit still and cower in place, if it is for example in a cover hex (rough say).

Retreat and rally is complex, and the rally hex is not a "global override", just a suggestion the scenario designer puts there that it may or may not heed.