per: Make more sensible use of pf in AI diplomats co...

This is an automated notification of a change to freeciv cvs, 
on Mon Oct 13 00:30:57 PDT 2003 = Mon Oct 13 07:30:57 2003 (GMT)
by Per I. Mathisen <per@xxxxxxxxxxx>

---- Files affected:

freeciv/ai aidiplomat.c
freeciv/common/aicore pf_tools.h

---- Log message:
      Tag: HEAD

Make more sensible use of pf in AI diplomats code, and remove the
simple unit path iterators in favour of an even simpler pf_iterator.

Fixes bug #4358, diplomats can get stuck on goto, and changes
diplomat tactics slightly in view improved diplomat-vs-diplomat rules,
so that diplomats will stay behind to defend city more often (stay if
only diplomat and city is in urgency).