Add required include
Copy files from Vc repository , latest updated to head of 0.7 branch

- add only for clang compiler flag -Wno-unused-funciton to suppress the warning
Const.
Include.
Re-apply fixes for math test on MacoS. Add changes only in case of Vc_Scalar implementation
Cleanup and makeup
Cleanup
Cosmetics
Cleanup includes and small cosmetic mods.
Cleanup and some cosmetic mods.
remove a redundant include
Add missing headers, remove redundant + cosmetic changes.
Headers/comments/cleanup.
Missing includes.
More logical
Correct the insertion of the rootmapfile entry in the already seen forward decls. (ROOT-6063 and 6141).
Copy from Vc git the patch to fix integer comparison warning
Copy from vc Vcmacro.cmake file (remove my changes for suppressing unused function warning)
Improve histogram zooming with mouse wheel.
Fix doxygen typos. Thank you clang.