Fix for ROOT-6836 (make build fails on Yosemite)
Rename stressReadOnly, to not class it as a stress test
Fix doc warning.
C++11 is required
Increase version number to avoid spurious warning.

The warning happens when reading a new file (v5.34/21) in an older version of ROOT (v5.32 for example)
(i.e. forward compatibility).  The Warning is due to the typedef now be stripped away in checksum
calculation.
Give cling the LangOpts clang has.
Fix clang / cling LangOpt discrepency on Linux.
Fix doxygen warning.
Run stressTMVA in batch mode (fixes headless cocoa).
Always delete the array when the array size goes down to zero.

This fixes a problem seen by CMS when using TH1::Copy on histograms read
from a TTree.

This amend commit d31f38f98c66af492c20c3bf060df13d64c465f0 (circa 2005)
Hide all llvm, clang, cling includes behind a facade.
Return 0 to signal missing symbols.
Be explicit about what failed to "compile" (now that we know).
Added complexDict.so to the CMake build.
- Sometimes an extra point appeared in the center of a TGraph2D plot (when drawn with markers)
  The problem was mentioned here: http://root.cern.ch/phpBB3/viewtopic.php?f=3&t=18787&start=15
- Better manage the attributes reset when going from a markers representation to an other (P, P0, PCOL).
TGraph2DPainter
TInterpreter::Declare(): #include with all interpreter extensions disabled.
Rename readonly to stressIOPlugins; only build if XRootD is on.
Adapt CMake to new file name.
Introduce TInterpreter::Declare().