Variable Size Regions! Support for prehash RegionSizeX and large patches. (WIP)

Mostly from Ukando, tweaked a bit to be cleaner, and a little less dramatic.

decode_patch_header now takes a bool optionally, as third argument.
_PREHASH_RegionSizeX is the only used of the two _PREHASH_RegionSize*.
llsurface.cpp: Copy the connectNeighbor for variable size regions almost directly from Ukando
llsurfacepatch.cpp: Patch code from ukando and voodoo.
Changed hardcoded 256 constants and such to width functions in: llglsandbox.cpp, llsurface.cpp, llviewerregion.cpp, llviewerparcelmanager, llviewerparcelmgr.cpp, llvowater.cpp, llworld.cpp
Use region specific width in: llagent.cpp, llglsandbox.cpp, llmanip.cpp, llmanipscale.cpp, llpanelobject.cpp, llviewerbject.cpp, llwind.cpp
Use 256 in llnetmap.cpp in places...
llfloaterregioninfo.cpp: Aurora grid has wacky textures.
Add LLViewerParcelMgr::widthUpdate() for updating mParcelsPerEdge given a region's width. Used in llstartup now.
Add LLWorld::setWidth() for getting a region's size from LLMessageSystem pointers and setting mWidth and mWidthInMeters, accordingly. Called in llviewermessage.cpp as well.
Merge branch 'master' into VarRegion
AuroraSim: non-power-of-two support.
AuroraSim: More tiny bits to help life be normal on the grid.
small typo fix
update spanish translation: add New menu avatar floater, Multiple voice support checkbox in preferences
Merge remote-tracking branch 'Liru/master'
update spanish translation: fix in panel_login.xml file
Merge remote-tracking branch 'Liru/master'
Merge remote-tracking branch 'Liru/master'
Merge remote-tracking branch 'Liru/master'
Update Spanish Translations.
Merge remote-tracking branch 'Liru/master'
Allow export full perm item on opensim if it doesn't support the export bit.

This addresses
https://code.google.com/p/singularity-viewer/issues/detail?id=1003
Merge branch 'master' of git://github.com/AlericInglewood/SingularityViewer
Merge branch 'master' of https://github.com/MelanieT/SingularityViewer
Added bits required for webkit volume adjustment to work on windows (xp included).
Merge branch 'master' of git://github.com/Shyotl/SingularityViewer
Merge branch 'master' of https://github.com/DamianZhaoying/SingularityViewer
Touchup to conform to format standard