Initially the plot buttons and parameters didn't do anything in the model. Checking the box now sets if plots are created for the workspaces.

Saving the current calibration locally so it can be accessed by other tabs.

Initial version of the model. Currently missing the plotting, file creation, and file system interaction.

Vanadium corrections are used across the various
tabs, so the functionality is refactored out of the
calibration tab's model.

Non functional right now...

`unicode` doesn't exist in python 3, use six.u instead