Updated unit tests to reflect changes to `run_details.py` and fixed minor error
that tests caught after updating.

Removes chaining callbacks together to access a dictionary. This is one
of the things originally added to the scripts which should have been
removed.

This overly complex piece of code attempted to take the DRY pricnciple
to an extreme. Instead each instrument should just specify the layout of
their file

This reverts commit 67938cfc.
I realised that this would be a good exercise for the next person
to take over isis_powder, so have left the commit in for reference

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This allows them to be renamed more conveniently, a al RenameWorkspaces

When the total current in a run is 0 (ie no counts were received), don't
bother normalising by current (as we get a divide by 0 error), and also
don't bother subracting the empty as it gives negative counts

These include caching the value returned by len to prevent it being called
more than once, replacing a simple loop with a list comprehension, using
StoreInADS=False instead of calling DeleteWorkspace on an intermediate
workspace and clarifying the changes in the docs

HRPD decided they want a suffix parameter with the behaviour
of the one recently implemented for POLARIS. The suffix-related
was moved from POLARIS-specific scripts to abstract instrument in
order to expose it to all instruments, should they want to use it

A working check that the loaded workspace in spline division helper was
added, and an error is now thrown if there is a mismatch between the
number of banks in the spline and the number of banks in the run

The common vanadium division function was improved to allow for loading a
single spline instead of a group.

The number of banks and number of cropping windows was added to the error
message that occurs when these are not the same, in order to make
debugging this problem easier.

This will done in a sepearte issue

Refs #21214

Refs #21214

Refs #21214

Refs #21214

This will done in a sepearte issue

Refs #21214

Refs #21214

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