Refs #14129

The initial value had the wrong type so each additional was converting
the double to an int leading to the incorrect result.
Refs #14129

Unfortunately these are required as the algorithms are in the wrong package.
Refs #11209

Add options to move the banks and set the pixel spacing for the fake instrument.

This is an important feature of working with SCD data, where we want to move the bank in such a way that we have coverage for specific reflections. I've unit tested the two new properties I've added as part of this. The default behaviour will be exactly the same as before.