YAXT

In summary the changes are:

• Better support for BlueGene/Q and cross-compilation.
• Copy constructors for xmaps and redists.
• Support for overlapping redist repeat constituents.
• Stricter declaration of some API functions (added const).
• 2 edge cases in stripe overlap got fixed.
• The tests got improved in numerous little places.
• Internal memory allocations have slightly less overhead.