[ann] T-Engine4 / ToME4 beta6 unleashed!

[DarkGod]

(I setup followup to rgrd)

As promised here comes T-Engine4 and ToME4 beta6 ! See
http://tome.te4.org/ http://te4.org/ http://blog.te4.org/

OSX binaries will come hopefully tomorrow and the linux binaries are
suspended for now until I find a good way to make them.

This release is mostly beta5 without the bugs, plus a few other nice
display things to make your wait worth it :)

Changelog:

* Fixes random crashes and load errors 
* Reworked the internal CMap, it now does not know what a terrain or an
  actor is, instead the map objects are just textures, positioned on a
  z-order, each map object can tell if it can be seen, remembered, ...
* Trees are now made of two or more map objects, a patch of grass and
  one or more tree, randomly placed on the tile, to make forests look less
  tilish
* Fix shaders to always use floats
* Fix dual shot to only use 2 arrows
* Random tree layout will try to place lower trees on top 
* Fixed FOV update when running
* Don't allow jumpgate to work between levels 
* Fix lots of monsters that did not deal damage 
* Download without music (for slow connections) are available

Have fun !