Refs #13262

Re #13383

re #11966

re #11966

changed descriptions for BankPixelWidth and PixelSpacing.
Added Property SourceDistanceFromSample
Extended docs to include information about the instrument created.

re #11966

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.

CreateSampleWorkspace does not set up a ReferenceFrame which is consistent with the actual layout of the instrument.
I don't know how this probelem got in there in the first-place, or why it hadn't cause problem up to now! Peak calculations require that the reference frame is known so that we can dot product with the beam direction in order to determine dQ.

Fixing this should now make the doc-tests pass.

This reverts commit 6ace8fec.

The converted text is stored in separate .rst files in the docs directory.
Refs #9562