disable fake finit difference for conmin
Merge pull request #1756 from Kenneth-T-Moore/dfd

Disable fake finite difference for conmin
Better error message if the external code command does not exist
Merge pull request #1757 from hschilling/P70397910-better-error-external-code

Better error message if the external code command does not exist
Fix for complex stepping deeply recursed assys
Float now always allows complex input.
Merge pull request #1759 from Kenneth-T-Moore/dfd

Fix for complex stepping deeply recursed assys
Fix for replacing CaseIteratorDriver parameter target.
Merge branch 'dev' of github.com:OpenMDAO/OpenMDAO-Framework into bug
Add test for CID problem.
Merge pull request #1760 from setowns1/bug2

Fix for replacing CID parameter target
Merge branch 'dev' of github.com:OpenMDAO/OpenMDAO-Framework into simplify
fixed issue with removing a pseudocomp that was already gone
Merge pull request #1761 from naylor-b/simplify

removed invalidation, runtime source checking, and a few other things
starting to add subsystems to serial execution
merged out from dev
interim. starting to unify MPI and non MPI parts