Fix for http://root.cern.ch/phpBB3/viewtopic.php?t=15886
Added TBits::LastSetBit and TBits::LastNullBit analogous to TBits::FirstSetBit and TBits::FirstNullBit
add gviz/doc directory and default index.txt file. Fixes ROOT-5396.
Import from master: Allow to change text of context menu items even when they are of type "toggle"
Import from master: Fix a problem on Windows with TContextMenu::Execute() parameters
  Verbosity control in TProofPerfAnalysis

  Add possibility to switch off constructor verbosity; introduce a separate member variable
  for single methods verbosity.
Fix issues found by Coverity
No PID in PROOF env and rootrc files
Add support for per-packet max proc time
Fine-tune previous patch