iotype metadata for slot causes DeprecationWarning. Added test to make sure warning is raised.
Fixed some errors. Formatted deprecation text.
Merge branch 'dev' of https://github.com/OpenMDAO/OpenMDAO-Framework into bugfix-61060138
Merge remote-tracking branch 'upstream/dev' into feature-instance
Fixed slot, componenets, drivers and tests. Still need to fix CaseIteratorDriver.
Resolved merge conflict
Added connectable versions of containers that use Slots with ioytype
Merge branch 'dev' of https://github.com/OpenMDAO/OpenMDAO-Framework into feature-instance
Fixing metamodle and doedriver
test_constat_inputs uses ConnectableMetaModel
Merge branch 'dev' of https://github.com/OpenMDAO/OpenMDAO-Framework into feature-instance
Merge branch 'dev' of https://github.com/OpenMDAO/OpenMDAO-Framework into feature-instance
Merge branch 'dev' of https://github.com/OpenMDAO/OpenMDAO-Framework into feature-instance
Merge branch 'dev' of https://github.com/OpenMDAO/OpenMDAO-Framework into feature-instance
Added entry points for new classes. Fixed tests
Merge branch 'dev' of https://github.com/OpenMDAO/OpenMDAO-Framework into feature-instance
Merge pull request #1579 from crobinsonut/feature-instance

Removed iotype from Slot traits.