libatmosphere integrated in indra/llrender/llatmosphere.cpp

Still working on runtime shaders to use libatmosphere precomputed atmospherics textures

Building headless and non-headless libraries side-by-side, removing the need for the BAKING cmake setting.

Reviewed at https://codereview.secondlife.com/r/167/
(The patch to create this commit was taken from there, too. That patch
was made relative to 5f0ab9443ece. Applied cleanly to the (earlier)
43b4b7927c00.)

Also fixes OPEN-36

Merge of QAR-1267 to trunk.  This was a combo merge of QAR-1175 (maint-render-9) and QAR-1236 (dll-msvcrt-2)

svn merge -r 109838:112264 svn+ssh://svn.lindenlab.com/svn/linden/branches/maint-render/maint-render-9-merge-r109833

Result of "svn merge -r 90669:90786 $tulla/file-move-merge ."

Be careful of future merges involving changes to any of these moved files as SVN usually does the wrong thing:
newview/llglslshader.* -> llrender/llglslshader.*, llrender/llshadermgr.*, newview/llviewershadermgr.* (gets split into 3 separate files)
newview/llpostprocess.* -> llrender/llpostprocess.*
newview/llrendersphere.* -> llrender/llrendersphere.*
newview/llcubemap.* -> llrender/llcubemap.*
llwindow/llgl.* -> llrender/llgl.*
llwindow/llglstates.h -> llrender/llglstates.h
llwindow/llgltypes.h -> llrender/llgltypes.h
llwindow/llglheaders.h -> llrender/llglheaders.h

dataserver-is-deprecated
for-fucks-sake-whats-with-these-commit-markers