If custom spectra was selected from the dropdown and then the tick box
was deselected, the GUI would still check the validity of the spectrum
numbers. As this was usually empty, the calibration would fail to run.

Entered values are spectrum numbers, which means 0 is not valid.
Also any value entered > 2400 resulted in errors.

Also removes the existing functionity for selecting a bank, as this can
be handled by the cropping widget.

Adds basic controls to presenter for showing and hiding.

Also update presenter to fix minor bugs found while testing.

For some reason doing this without a type worked fine on my machine, but
not on the CI builders.

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.

Focusing now saves as .gss, .nxs, and .dat files.

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

Before, the file finders (MWRunFiles) could only be made read-only,
which did not grey out the text field, just the browse button. This
option has been added and used instead for the file inputs that should
not be used.