[Freeciv-Dev] AI cleanup V2 (PR#1171) Part Two

[Raahul Kumar <raahul_da_man@xxxxxxxxx>]

This is the new improved AI cleanups. It does 3 things

Get rid of a few more one letter variables like c,m with better names
like move_rate, move_time

Clean up more hardcoded nos relating to movement with SINGLE_MOVE etc
substituted, Basically, I am finishing off the changes my original movement
patch introduced.

Raimar's unit move turns, which is a nice rewrite of a very ugly function.
Inspired by me, changes suggested by GB.

It's a fairly simple patch, there should be no great dramas deciphering it.


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