Merge pull request #43 from paulvojta/master

Fix various misspellings
Fix bug 2824 (?): increase displayed image size.
fix bug 2817: move use of variable after its definition.
fix bug 2776: ensure a non-negative domain for checking
Correct typo in solution, add explanatory comment there.
fix bug 2785: clarify specification of region.
fix evaluation function typo.
Reduce fraction further

This is an alternative to the last bugfix that has the added benefit of reducing the fraction.
Improve problem wording.
Add units to statement of initial condition.

Paul: please track status of "bug/query" 2838 and
	consider whether a batch of these problems might benefit from
	replacing helpLink with AnswerFormatHelp.
For my part, I am curious whether any of my students will comment about this.
Merge pull request #44 from Dick-Lane/master

Add units to statement of initial condition.
correct typo in solution text.
fix bug 2294 (finally).
Fix bug 2828
resolve (?) bug 2601: explictly note that all answer blanks must
contain values.
fix bug 2402: make answer display numeric, matching information available
to students.
fix bug 2605: add parens to clarify problem display.
Fix bug 2834, made variation of a problem and put them in a MLT group.
Fix bug 2836.
Merge branch 'master' of github.com:openwebwork/webwork-open-problem-library