Wester test cases N12-O3 added
Corrected enf of file character
Wester test cases 04-P8 implemented
Wester N12-P8 test cases added
Issue 694: Add tests from "Review of CAS mathematical capabilities", by Michael Wester

Added test cases from N12 to P8.
Added Wester test cases P10,P11,P12
Corrected test cases N12-N16 after Randy's review.
Added missing test case P9.
Added P13-P19 test cases
Corrections after feedback from Aaron for P3, P9 and P12
P3 added. P9 was wronlgy named P3. __remove_whitespaces() removed. P12 corrected.
removed __remove_whitespaces()
Added caching to delta in concrete, for speed.

Otherwise, testing it takes a long, long time.
Split the tests for deltaproduct and deltasummation.
Fix the no_piecewise logic for recursive deltaproduct calls.

Fixes the first two tests reported in issue 3987, where a Piecewise
was missing to really make the result valid for all input.

Note that this does not address the Karr convention; limits have been
assumed and are still assumed to be in increasing order.

c.f. issue 3987: wrong tests in test_deltaproduct
http://code.google.com/p/sympy/issues/detail?id=3987
Corrected P19, added P20
Added Wester test cases P26-P41
Fixed P25 with round()
Removed mpmath.inf. Fixed P8. Added P42, P43.
Corrected P43. Added P44.
Fixed test_P25() round error with python3
Removed unused import time