Break the graphviz layout engine up a bit so we can call sfdp with 3D switched on
Global constants should be capitalized
Merge remote-tracking branch 'gh/dev' into dev
Update tests to current structure
Update reference particles
Ignore input files that find their way here
Merge branch 'fix_tests' into dev
Add helper script to generate WHAT_IS_NEW
Make new tag 2014.12.21