add wrapper in MDArray for class cern.colt.GenericSorting

[rbotafogo]

Generically sorts arbitrary shaped data (for example multiple arrays, 1,2 or 3-d matrices, and so on) using a quicksort or mergesort. This class addresses two problems, namely

Sorting multiple arrays in sync
Sorting by multiple sorting criteria (primary, secondary, tertiary, ...)
Sorting multiple arrays in sync

Assume we have three arrays X, Y and Z. We want to sort all three arrays by X (or some arbitrary comparison function). For example, we have
X=[3, 2, 1], Y=[3.0, 2.0, 1.0], Z=[6.0, 7.0, 8.0]. The output should be
X=[1, 2, 3], Y=[1.0, 2.0, 3.0], Z=[8.0, 7.0, 6.0].