added gui function model.get_all_attributes()
& associated handlers
fixes to passthrough editor for efficient loading
fixed passthrough editor tests
Merge branch 'dev' of https://github.com/OpenMDAO/OpenMDAO-Framework.git into guidev
fixed passthrough editor bug - component-level leaf not checkable
Merge branch 'dev' of https://github.com/OpenMDAO/OpenMDAO-Framework.git into guidev
Merge pull request #1308 from thearn/guidev

Guidev