add a minimum refinement function mesh refinement criterium
change the default values of the melt fraction postprocessor to match the values in the papers
remove include
rename the variable we loop over from i to q in the loops over all quadrature points
add an assert
add a test for latent heat
update changes.h
add some comments and remove the maximum grid level input parameter from the tag_additional_cells function
add a test for the minimum refinement function
Merge branch 'refinement' of https://github.com/jdannberg/aspect

Conflicts:
	doc/modules/changes.h