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()
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
Added tests P45, R1-R11
Added tests R12-10
Added tests R12-S10. Added missing @XFAIL.