+ * mkFoldBuilder is added to @Data.Histogram.Fill@
+ * fill functions in @Data.Histogram.ST@ are replaced with generic
+ * Indexing for immutable histograms is added and special constructor
+ for first and last bin are added to @HistIndex@ data type.
+ * Functions to calculate sum, minimum and maximum of immutable
+ * Helper function for defining Read instances for bins are exposed.
+ * mapData function is added.
+ * Slicing histogram do not results in crash if indices are out of
+ * Eq instances for BinF and BinD are added.
+ * NFData instance for Bin2D is fixed.
+ * Helper function and type synonym for Bin2D
+ * Fixed compilation with GHC 7.4