Merge pull request #29 from Dick-Lane/master

my first commit of bug fixes
Add limits to answer checker
Tidying up the file, no functional difference.
Fix problem where blank answer is expected.
Remove extraneous reference in problem text and remove extra answer blank.
Fix bug 2772, set flag reduceConstants to 0
Fixed bug 2778, tabular needed to be array
New elementary matrix problem.
Fix bug 2780, fix popup problem, changed "relation" to "function" since it is using function notation, and removed part with was mathematically incorrect.
Fixed bug 2781, typo
New elementary matrix problem.
Merge branch 'master' of git://github.com/openwebwork/webwork-open-problem-library
Small fix.
Fix bug 2782
Merge branch 'master' of github.com:openwebwork/webwork-open-problem-library
Small fix.
Merge branch 'master' of git://github.com/openwebwork/webwork-open-problem-library
Remove "Question #" from top line of problem statement.

Rationale:
  a) specific to FMC 3ed but often wrong for FMC 4ed
  b) distracts students unless in an assignment
	whose name or Header specifies text section