Fix TH1::Smooth for histograms with less than 3 bins (ROOT-5307)
fix ROOT-5241 by implementing the option 'noclear'.
THStack
remove workarounds that are no longer needed (ROOT-5623)
remove workarounds that were there only to support the now removed workaround in constructors
make sure that we get an error report and not a crash
Implement a new function TH1;:Chisquare to compute the chi-square of an histogram given a function
(see ROOT-4722)

Re-implement TGraph::Chisquare as TH1::Chisquare using the ROOT::Fit::Chi2FCN class.
Add also option "R" to compute the chi2 in the given  function range (by default the range now is given by the data object - graph or histogram as it is done in Fit)

Conflicts:
	hist/hist/inc/TH1.h
	hist/hist/src/HFitImpl.cxx
	hist/hist/src/TH1.cxx
Change TGraph::Chisquare to pass a non-const TF1 pointer, since TF1::Eval is not const
workaround for ROOT-5781
fix for ROOT-5769
type check to prevent crashes
clarification
check TInterpreterValue::IsValid() rather than GetAsPointer() to check validity
see discussion on ROOT-5623 ... hopefully this makes both Marco and Philippe happy
Implement several missing functions (for Windows) in DynamicLibraryManager and fix a couple of compilation errors on Windows
Fix: http://root.cern.ch/phpBB3/viewtopic.php?f=3&t=17382
The TMathText case should be taken into account in GetBoundingBox, GetXsize and GetYsize.
Do not ignore Mode and ForceUpdate in AliEn dsets
Hidden interface by making a method protected
Faster AliEn dir verification code
Improved AliEn dataset retrieval with run ranges

Since run ranges usually contain many "holes", yet they are more
convenient to use than specifying a list of runs manually, a
preventive check to prune invalid run numbers is performed: AliEn
queries on non-existing runs are consequently avoided.