Import roofit/roofit(core) changes from dev/roostats branch to trunk 

=== r34062 ===

   o RooProdPdf

     - Fix compilation error on Windows

     - Fix memory leak

     - Fix some shadowing problems


   o RooDataHist

     - Fix memory leak


   o RooFactoryWSTool

     - Add syntax checker routine to factory front-end. At present
       this counts only of all pairs of (),[],{} match.

     - Add factory syntax 'set::name(a,b,c)' as factory syntax for
       RooWorkspace::defineSet("name","a,b,c") ;


   o RooAddPdf 

     - Fix memory leak

  
   o RooAbsNumGenerator, RooAcceptReject, RooFoamGenerator

     - Fix uninitialized pointer problem spotted by valgrind


   o RooRealMPFE

     - Fix gcc 4.4 warnings by checking return values of all read(),write()
       and pipe() calls.


   o RooAbsPdf

     - Fix variable shadowing issue


   o RooRealIntegral

     - Fix memory leak
      

   o RooTreeDataStore

     - Fix memory leak


   o RooSimultaneous

     - Fix variable shadowing issue


   o RooGlobalFunc, LinkDef2

     - Include fix from Kyle/Axel to solve include guard issue in macros
       for namespace RooFit

=== r34020 ===

Update to RooRealSumPdf where normalization had memory leak


=== r33961 ===

 o RooAbsReal

   - Add new method setEvalErrorLoggingMode() that takes three options
     PrintErrors (default), CountErrors (new) and CollectErrors (supports
     structured printing during minimization

 o RooRealMPFE, RooMinimizerFCN, RooMinimizer, RooMinuit

   - Follow changes in RooAbsReal


 o RooAbsPdf

   - Make getLogVal() return log(0) when probability is zero, rather than zero,
     to support operation of (non-log) likelihood functions


=== r33945 ===

 o RooNumRunningInt, RooCachedPdf, RooCachedReal

   - Use aggregateCacheUniqueSuffix() advertised by content to 
     distinguish objects with identical structure that have
     different non-parametric content (such as likelihood functions)


 o RooAbsCachedPdf, RooAbsCachedReal

   - Allow addition of additional suffix to name of object cached
     in expensive object store

 o RooAbsReal

   - Introduce virtual function cacheUniqueSuffix() that allow function
     objects that have non-parametric content that can cause two instance
     of an object with the same parameter to behave differently (e.g. likelihoods that
     have different datasets but the same pdf) to advertise a string suffix
     that can be attached to the index name in the expensive object cache to
     distinguish different instances

   - Introduct method aggregateCacheUniqueSuffix() that concatenates all suffixes
     produced by any branch node into a single string

 o RooAbsOptTestStatistic

   - Advertise dataset pointer as unique cache suffix


o RooProdPdf

   - Large scale adjustment to code to be able to handle pdfs where
     the normalization range of its observables is defined by
     multiple ranges rather than a single range

 o RooMsgService

   - Add concept of debug workspace and debug code to facilitate
     debugging of complex problems


 o RooGenContext

   - Force use of Accept/Reject sampler for problems with observables where
     the range depends on other observables as Foam cannot handle these

 o RooDataSet

   - Bug fix in handling of weights in append() operation


 o RooAbsGenContext

   - Add support for handling of explicit normalization range(s)


 o RooAbsReal

   - Bug fix in createIntegral(), avoid use of strtok() due to possible recursive use


 o RooAddPdf

   - Large scale adjustment to code to be able to handle pdfs where
     the normalization range of its observables is defined by
     multiple ranges rather than a single range

 o RooAbsPdf

   - Add support for definition of multiple normalization ranges, with setNormRange()
     as user front end


 o RooAbsArg

   - Fix bug in link state management: a state change to ADirty must be propagated to
     all clients.

   - Add maximum level argument to printComponentTree()


 o RooRealIntegral

   - Fine tuning of debug-level print messages

   - Fix memory leak


 o RooAddGenContext

   - Add support for handling of multiple normalization ranges


 o RooRangeBoolean

   - New RooAbsReal implementation that returns 1 or 0, depending on another observable
     having a value in a predefined range


 o RooAbsIntegrator

   - Fine tuning of debug-level printouts


 o RooTreeDataStore

   - Multiple bug fixes in handling of weighted data


 o RooAbsOptTestStatistic

   - Small changes to support operation with multiple normalization ranges


 o RooArgSet

   - Add utility method isInRange() that is forwarded to content


 o RooGenProdProj

   - Add new operation mode that does not factorize, which is needed for certain cases
     with multiple n


=== r33943 ===

o RooProdPdf

   - Large scale adjustment to code to be able to handle pdfs where
     the normalization range of its observables is defined by
     multiple ranges rather than a single range

 o RooMsgService

   - Add concept of debug workspace and debug code to facilitate
     debugging of complex problems


 o RooGenContext

   - Force use of Accept/Reject sampler for problems with observables where
     the range depends on other observables as Foam cannot handle these

 o RooDataSet

   - Bug fix in handling of weights in append() operation


 o RooAbsGenContext

   - Add support for handling of explicit normalization range(s)


 o RooAbsReal

   - Bug fix in createIntegral(), avoid use of strtok() due to possible recursive use


 o RooAddPdf

   - Large scale adjustment to code to be able to handle pdfs where
     the normalization range of its observables is defined by
     multiple ranges rather than a single range

 o RooAbsPdf

   - Add support for definition of multiple normalization ranges, with setNormRange()
     as user front end


 o RooAbsArg

   - Fix bug in link state management: a state change to ADirty must be propagated to
     all clients.

   - Add maximum level argument to printComponentTree()


 o RooRealIntegral

   - Fine tuning of debug-level print messages

   - Fix memory leak


 o RooAddGenContext

   - Add support for handling of multiple normalization ranges


 o RooRangeBoolean

   - New RooAbsReal implementation that returns 1 or 0, depending on another observable
     having a value in a predefined range


 o RooAbsIntegrator

   - Fine tuning of debug-level printouts


 o RooTreeDataStore

   - Multiple bug fixes in handling of weighted data


 o RooAbsOptTestStatistic

   - Small changes to support operation with multiple normalization ranges


 o RooArgSet

   - Add utility method isInRange() that is forwarded to content


 o RooGenProdProj

   - Add new operation mode that does not factorize, which is needed for certain cases
     with multiple normalization ranges

=== r33758, r33720 ===


 o RooPoisson

   - Fixes in internal generation code


 o RooLogNormal, RooGamma, LinkDef1

   - New classes contributed by Gregory Schott


git-svn-id: http://root.cern.ch/svn/root/trunk@34064 27541ba8-7e3a-0410-8455-c3a389f83636