Lots of changes to RichardsBorehole, and minor changes to the tests.  This addresses issue #2750 .  Changes include: character is a function; well_constant added to user interface; auxvars added so RichardMaterial values do not need to be used; better algorithm for eigenvalues/vectors ; contribution behind and ahead-of is now better for boreholes with lots of points; and fixing some tabs and banned keywords.  Also implemented suggestions from Andrew S.
Hiding error message if git is not used for checkout - closes #2732
Error check - closes #2748
Fixing documentation with Refs #2758
Merge pull request #2759 from joshua-cogliati-inl/feature_2758

Fixing documentation with Refs #2758
Merge pull request #2752 from WilkAndy/feature_2750

Lots of changes to RichardsBorehole, and minor changes to the tests.  Th...
Merge commit '0109985e4a51ec453d777554f629f675940d5e9f'
Merge pull request #2754 from permcody/git_warning_fix

Hiding error message if git is not used for checkout
Merge commit '20b4bf610fe4384efbddcfc1e745d650c2627690'
dont return 4 closes #2699
Merge pull request #2755 from permcody/error_check_extra_nodeset

Error check for MeshModifier add extra nodeset
Merge pull request #2761 from friedmud/maxqp_2699

don't return 4
Merge commit '718a78f3522711a07065efc4410a389e6330e13a'