Import last set changes from 534 patch branch
 -----------------------------------------

*** r47035 ***

  o RooCachedReal

    - Bug fix: attach parameters of function clone to those of tracker
      to retain connection with original parameters


  o RooNameSet

    - Implement operator<() and operator()= to allow use as key in stl::map


  o RooAbsCachedReal

    - Expose source clone in CacheElem as contents to facilitate correct link
      redirection on cache content

    - Set cached source clone and cached datahist to ADirty mode to speed up
      scanning of cache when recalculating


  o RooAbsAnaConv, RooTruthModel, RooResolutionModel

    - Add interface to allow resolution model to return GenContext, needed
      for special pdfs with custom efficiency handling


  o RooAddGenContext

    - Make coefficient interpretation used in GenContext not forcibly override
      any existing custom choices to allow user to override default choice
      with his own

*** r46916 ***

  o RooWorkspace

    - Increment all string buffers from 1024 to 10k

*** r46696 ***

  o RooVectorDataStore

    - Fix stress test failure (check _wgtVar before using it in loadValues()

*** r46691 ***

  Support changes of weight variable (was no longer possible with last fix)

  o RooGlobalFunc

    - Add optional argument to WeightVar() that when true signifies that
      given column should be reinterpreted as weight when used in combination
      with the Import() of an already weighted datasets

  o RooDataSet, RooVectorDataStore
 
    - Implement support of new Import() option


*** r46666 ***

  o RooDataHist

    - Set importDensity to false for all constructor forms that import TH1s
      (to be consistent with Import() setting)

*** r46611 ***

 o RooAddPdf

   - Increase size of _coefCache to 100 elements in default ctor

*** r46603 ***

  o RooVectorDataStore

    - In loadValues() add special handling for cases where weight name
      in source and target dataset are not identical


  o RooRealSumPdf

    - Add flag to optionally truncate negative values to zero


  o RooMinuit, RooMinimizer

    - Add option to generate error status when FCN exceeds 1e30


*** r46575 *** 
 
  * RooFit Fixes from LHCb


*** r46573 ***

  o RooBanner

     - Increment version tag to 3.55

*** r46571 ***

   o RooFitResult

     - Disable default filling of legacy correlation matrix to save memory and CPU.
       It wil still be filled on-demand when it is accessed


git-svn-id: http://root.cern.ch/svn/root/trunk@47038 27541ba8-7e3a-0410-8455-c3a389f83636