[FEATURE] adds 3 new classification algorithms, including natural breaks (jenks), standard deviations, and a 'pretty' algorithm for generating 'human readable' class breaks

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@14401 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: cfarmer

src/core/symbology-ng/qgsgraduatedsymbolrendererv2.cpp

@@ -351,8 +351,8 @@ static QList<double> _calcPrettyBreaks( double minimum, double maximum, int clas
   // from the R statistical programming language.
   // Code ported from R implementation from 'labeling' R package
   //
-  // Computes a sequence of about 'classes' equally spaced 'round' values
-  // which cover the range of of values from 'minimum' to 'maximum'.
+  // Computes a sequence of about 'classes' equally spaced round values
+  // which cover the range of values from 'minimum' to 'maximum'.
   // The values are chosen so that they are 1, 2 or 5 times a power of 10.
 
   QList<double> breaks;