fixes wrong refs
trying to group nodes by workflow - not really working yet
Merge branch 'dev' of github.com:OpenMDAO/OpenMDAO-Framework into dotgraph
tweaking component graph plot with workflows
Merge remote-tracking branch 'origin/dev' into dev
Merge pull request #1743 from setowns1/bug

Fix connections broken during CaseIteratorDriver egg creation.
added cross workflow connections
Merge pull request #1744 from naylor-b/dotgraph

updates to dot graph plotting
removed stepping
Merge pull request #1745 from naylor-b/simplify

removed stepping
Merge remote-tracking branch 'origin/dev' into dev
improve accuracy using erfc(1-erf(x)) not erf
Merge pull request #1746 from cwmine/dev

improve accuracy of PI and EI using erfc
minor fixes, added excludes list
Merge pull request #1748 from naylor-b/dotgraph

minor fixes, added excludes list
switch to erfc for expectedimprovement_multiobj
Merge remote-tracking branch 'origin/dev' into dev
Merge pull request #1749 from cwmine/dev

switch to erfc for expectedimprovement_multiobj
improved finding of wing executable on windows
Merge pull request #1750 from naylor-b/wing

improved finding of wing executable on windows