Add error messages if construction of localization function fails.
Merge branch 'release/1.8' of https://github.com/openwebwork/webwork2 into release/2.8
Merge branch 'release/2.8' of https://github.com/openwebwork/webwork2 into release/2.8
Fix typo in ProblemGrader. Add File::Find::Rule module to check_modules
Increase size of field for past answers
Add protection when a match for 'Tip' fails.
This is a hack fix -- I don't see why the problem is occuring in the first place but it
does thinks like prevent the knowls solutions from operating.
If this _is_ the correct fix it needs to be propagated to other themes.
Added field for date shifting
Merge branch 'newbutton2' into dateshift

Conflicts:
	htdocs/themes/math4/math4.css
Added date shift field.  When its nonzero the dates of all imported homework sets are shifted so that the earliest due date is set to the shift field.
fixed unintended change
another unitnended change
When sets were imported "regular" homework sets were having their assignment_type set to '' and not 'default'.
Merge branch 'release/2.8' of https://github.com/openwebwork/webwork2 into release/2.8
Make minimal tweaks needed to make LibraryBrowser3 list problems from sets and from Libraries
Implemented Greg Kraus' suggestions regarding aria landmarks
Merge pull request #225 from aorinevo/release/2.8

Implemented Greg Kraus' suggestions regarding aria landmarks
Merge branch 'release/2.8' of https://github.com/openwebwork/webwork2 into release/2.8_librarybrowser3tweaks
Correct behavior of HINTS and SOLUTIONs

Solutions are shown immediately to students in HTML mode after the due dates
Hints are shown to students in hardcopy after the answer date if they request it
Solutions and hints are not shown to instructors in hardcopy mode unless they request it.
Remove print message in xmlrpcCall return which was messing up the xmlrpcParser
Merge pull request #231 from mgage/release/2.8_Tags_bugfix

Remove print message in xmlrpcCall return which was messing up the xmlrp...