Merge pull request #86 from Alex-Jordan/pccProduction

updates to PCC Contribs BasicMath and Basic Algebra
Fix bug 3152 (fix by J. Holt)
Fix bug 3159
Fix bug 3160.
Really fixing bug 3159 this time.
Fix bug 3162 (answers unscrambled twice).
Fix bug 3166 and clean up solution code.
Fix bug 3167, poor wording.
Change Compute("NONE") to List("NONE")

to provide consistent error messages.
"from d to k" changed to "from d to j" (there is no option k).
Removed extraneous word "not"
Fixed typo (x --> n)
Fixed typo (sign error)
Fixed typo in solution
Fix tags
Fix bug 3170
Protecting "pi" as bareword
Change y= to x^2= in problem text

Used Simmons & Krantz section 1.2 problem 1j for the correct statement of the problem.
Fix bug 3150
Merge branch 'master' of github.com:openwebwork/webwork-open-problem-library