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.
Merge remote-tracking branch 'Liru/master'
Merge remote-tracking branch 'Liru/master'
added new floater_dae_export.xml translation file and other minor changes
Merge remote-tracking branch 'Liru/master'
Merge remote-tracking branch 'Liru/master'
update string.xml file for user status in panel avatar
Merge remote-tracking branch 'singu/master'
Trees shadow parameters use actual debug settings

Use RenderDeferredTreeShadowOffset, RenderDeferredTreeShadowBias,
RenderDeferredSpotShadowOffset and RenderDeferredSpotShadowBias
in place of hard coded values.
Merge branch 'master' of github.com:singularity-viewer/SingularityViewer
Merge branch 'master' of github.com:singularity-viewer/SingularityViewer
Merge remote-tracking branch 'Liru/master'
update spanish language file floater_dae_export.xml
Allow species selection for plant creation

Fixes hardcoded "Random" string for translation of this new combobox.
Merge branch 'master' of https://github.com/slabua/SingularityViewer
Harden agains network packet overruns

Patch by NickyD from Firestorm
Satisfy Issue 1115: Make clock on top status line toggleable

Click the clock to change from server time to local~