wdmerger 17.04

Remove obsolete diagnostics parameter

Merge branch 'development' of ssh://github.com/BoxLib-Codes/wdmerger …

…into development

Merge pull request #1 from bcfriesen/makefile_updates

sources: remove FCOMP from GNUmakefile

Do the gravity sync solve

Sync up with changes to gravity tolerance

wdmerger 16.09