Improve Python 2 compatability with "future" print_function.

Use python3 version of the print function when running
under python2. Also added "from __future__ import division"
to a few more module files.

Source/determinant.py

@@ -1,4 +1,7 @@
 
+from __future__ import division
+from __future__ import print_function
+
 class Determinant:
     """
         Determinant class - set up for later structurization