[Freeciv-Dev] (PR#4770) client-side patrol routes aren't safe

["Jason Short" <jdorje@xxxxxxxxxxxxxxxxxxxxx>]

The client just reverses the path to find the way from the end of the 
path back to the beginning.  This isn't safe; e.g., for tririemes which 
may have pauses in their paths.  Instead a new path should be generated 
for the return.

Question: should all of the waypoints be revisted in turn?  I don't 
think so - all we should do is complete the cycle.  This allows more 
flexible patrol routes, like patrolling in circles around an island.

jason