Refactor TListOfXYZ.
From Cristina: tests redirection.
scaling on retina displays
Fix in PROOF doc
Added dataset staging functions to PROOF-Lite
CPU pinning on Linux for PROOF-Lite
AliEn ds can cache site storage endpoint URL
From Anna: TASImage in gl-pad +

fix good old memory leaks in TASImage.
Fix  long long TMath::Abs for non CXX-11 versions
Do not draw any text if text size is 0 (we have duplicated labels otherwise).
correct valgrind suppression of TThread global mutex.