[z1913] Increment map version magic. You have to re-extract maps, vmaps and mmaps

With this commit, Pathfinding is implemented in MaNGOS!
Thank you very much to all who contributed, especially to Faramir118 and qsa.

Please report bugs and required offmesh changes, so that they can be adressed
For *nix users of the extractor, help about compiling content of contrib/ can be found in forums

(based on commit [s1495] - b313cc2)