[Freeciv-Dev] Changing interface for generate_warmap (PR#1108)

[Gregory Berkolaiko <gberkolaiko@xxxxxxxxxxx>]

This is a patch which changes interface of generate_warmap to:
1. Remove direct calls to really_generate_warmap
2. Provide the possibility of having a local warmap
3. Make recycling of the old warmap more transparent (I hope)

There is no rush with inclusion into CVS, but I would be grateful if you
comment on the implementation and on what else should be done.

Brief description:

To generate warmap now one has to pass the pointer to it.  If the pointer
is NULL, the static warmap local to gotohand.c is used.
Access and creator/destructor functions for warmaps are also provided.

Functions like find_the_shortest_paths use local warmap by default (which
renders it unrecyclable).

The old recycling rules are left in place.

Tested: the savegames are identical.

It is now possible to have warmap-per-city in the AI.  Even if all 
warmaps are refreshed every turn (unnecessary, but happens now), it will
still save some time (but not memory).

G.

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