GroupDetectors v2 should not leave 'empty' spectra lying around

[Nick Draper]

At the moment GroupDetectors leaves empty zeroed spectra in the workspace after it groups the spectra. A version 2 needs to be created that doesn't do this.

However there are several things to be careful of:

1. Managed workspaces have problems with changing the dimensions of the workspace (although Russell has some ideas of how we can overcome this).
2. Several algorithms already use GroupDetectors as a child algorithm, we need to ensure that the change does not adversely affect them.

[Nick Draper]

Suggestion:

Change away from the in/out workspace to an in and an out. Allow users to specify groups in bulk using a file.

Ideally the algorithm would work with either cal files, or a simpler format of

#udet     group
1           2
2           2
3           1
4           1 

[Nick Draper]

Moved as part of iteration 18 end

[Russell Taylor]

(In [2896]) Adding a GroupDetectors version 2. This one doesn't use an InOut workspace and doesn't leave 'empty' spectra lying around afterward. DiffractionFocussing v1 altered to still use GroupDetectors v1. Re #624.

[Russell Taylor]

Part one done (no more empty spectra). To be continued (by implemented the grouping in bulk from a file) in ticket #803...

[Stuart Campbell]

This ticket has been transferred to github issue ​1472