fix for #69,#70,#71, and #72

[rmcgurrin]

#69

In the Looper Form of MeasFilterViews.enaml, test that the selected
filter is in the filter dictionary else return -1
#70

Added a childFilter to the StateComparator class because it was missing.
#71

In the QtListStrWidget, test if the enable changed when the labels are the same
and the label is in the item list. Also, only signal a name change when the
labels are not the same and the newlabel is not in the item list. In the old
version of code there are some conditions when on_edit is called that result in
the dictionary manager trying to rename an item that does not exist.
#72

Added a new feature to save config in a different directory and load a config
from a different directory. After loading a config, the GUI will restart itself
for the changes to take effectively

[blakejohnson]

Rob, would you mind breaking out your fix of #70 so that we can discuss just that? The "childFilter" concept has largely been removed from the measurement filters, so I expect a different fix is needed.

[rmcgurrin]

I'm closing this review and resubmitting the review with the #70 change backed out. I'll tackle a root cause for that separately.

[blakejohnson]

There's no need to close a pull request for that kind of change. Just refactor your local branch as you want, and then force push the changes.