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.
Typo fix in derivative of lowergamma function
Added numerical derivative test for lowergamma, first parameter