Other grouping routines

```
 template <class T> void GroupBin(const std::vector<T>& inArray,
                                  const Integer mode,
                                  const grouping& GroupInfo,
                                  std::vector<T>& outArray)
```
```
 template <class T> void GroupBin(const std::valarray<T>& inArray,
                                  const Integer mode,
                                  const grouping& GroupInfo,
                                  std::valarray<T>& outArray)
```
This routine applies GroupInfo to the input inArray to create the output outArray. The behavior is determined by mode which can take five values: SumMode which adds the contents of all bins in a group; SumQuadMode which adds the bins in quadrature; MeanMode which returns the arithmetic mean of the all bins in a group; FirstEltMode which returns the value of the first bin in each group; LastEltMode which returns the value of the last bin in each group.
```
 Integer readBinFactors(string filename, IntegerVector& StartBin, 
                        IntegerVector& EndBin, IntegerVector& BinFactor)
```
Read a file containing grouping information and place into the arrays StartBin, EndBin and BinFactor. Each line of the file should have three numbers, the start bin, end bin, and grouping factor.