[Freeciv-Dev] (PR#6926) Extended Wrapping Topologies initialization

["Marcelo Burda" <mburda@xxxxxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=6926 >

Hello,
This patch Extend the initialization  process of a topology.
Actually we choice x-y sizes and x-y wrapping one at one.
When the arrival of new interesting topologies the choice is too complex, we 
can help this choice 
selecting x-y size ratios and x-y wrapping from a list of more interesting 
topologies. I choice of size 
of map, tiny, medium, etc is no cover by this patch but is probably a good idea 
too.  
The player change the topology id, and Freeciv make anything else.

This patch preserve the bits flags TF_WRAPX and TF_WRAPY, but there are 
deprecated by:
XWRAP_TYPE_IS( wrap_type) and YWRAP_TYPE_IS(  wrap_type)

wrap_type are on of this : WT_NONE, WT_SIMPLEST, WT_REVERSED
and probably some exotics ones in the future.

This allow some realy interesting topologies

Flat
Cylindrical (the classical one in freeciv)
Torus
Sphere (quincuncial and quincuncial_sq)
Cylinder electron. 

Itch one as different best x-y size ratios to initialize and  different 
wrapping.

This patch is 100% compatible (deprecated function works )
it provide

the initialization function and new variables.
Noting realy related with the quincuncial patch are included, exept the 
WT_REVERSED, and the list of 
topologies.

Somme code of Quincuncial patch can included (all in map.h and map.c is well 
tested) but i thinks we 
prefers  this.
Marcelo