The functionality was the same across calibration and focus.

Currently, there is no way to load a CSV file (which is the format
that the full calibration is in) into mantid to be used by the GUI.
Until that is added, the option to select the full calibration has been
hidden from the user.
The functionality is there, so once the loading works for large CSVs the
hide() call can be removed.

- Remove repeated searching checks

- Split test into reasonable chunks

- Make rb_num naming consistent

Vanadium output files are now saved to the user directory if an RB
number is specifies so that users can have all of the generated data
from processing.

Now using sample instead of a mix of both of these.

Loading the vanadium to be used later on makes more sense to do at this
stage than at the start of the focusing step.

The calibration parameter table that is generated when creating a new
calibration is now loaded back into mantid from the file as a table
workspace, rather then just working in the background.

Documentation has been added for the less obvious public and private methods.
Some of the methods in the model should be shown as private, so have
had methods refactored.

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