Allow time step to increase after shrinking.

This addresses issue #3764.
small style modifications refs #3765 #3764
Add test for regrowing DT with ConstantDT refs #3765 #3764
#3822 Changes to FunctionAux to make it work with higher order elemental variables
#3822 Additional changes and regolding
Thermal component of J with tests #feature 3807
Tweaks to calculation of thermal component of J ref #3807

Change some names
Error checking earlier on
Create properties used by J integral calculation only if needed
Merge pull request #3844 from snschune/feature_3822

#3822 Changes to FunctionAux to make it work with higher order elemental...
Merge pull request #3850 from bwspenc/feature_3807

Calculate thermal term in J integral
Merge pull request #3855 from friedmud/constantDtRegrow_3764

Constant dt regrow