Plus for MDEventWorkspace: implement algo

[Janik Zikovsky]

Maybe call it PlusMDEW?

The algo will merge two MDEventWorkspaces together by adding events together. Boxes split as needed.

Should handle file-backed MDEW in a reasonable way. Some work towards this has been done already.

[Janik Zikovsky]

In [13939]:

Refs #3555: Stub for PlusMDEW. Fix performance test run.

[Janik Zikovsky]

In [13968]:

Refs #3555: Plus algorithm for MDEventWorkspaces.

[Janik Zikovsky]

In [13971]:

Refs #3564: Menu to look at the boxes in a MDEventWorkpsace in MantidPlot. Refs #3555: Better thread safety for the Plus algo and DiskMRU in general.

[Janik Zikovsky]

In [13986]:

Refs #3555: PlusMDEW with file back end updates the file when done and releases memory.

[Janik Zikovsky]

In [13992]:

Refs #3555: Disable test to figure out win failure.

[Janik Zikovsky]

In [14023]:

Refs #3555: MDBox reworked to handle adding events without caching so that PlusMDEW works more efficiently.

[Janik Zikovsky]

In [14024]:

Refs #3555: Windows try

[Janik Zikovsky]

In [14026]:

Refs #3555: Disable test that fail on Windows

[Janik Zikovsky]

In [14044]:

Refs #3555: Fix segfault in a particular case involving the file back end and using PlusMDEW.

[Janik Zikovsky]

Note for testers: Algorithm works with both memory and file-backed workspaces. Performance should be decent for file-backed since it avoids writing out to file all the time. This means that you need to call SaveMDEW with UpdateFileBackEnd to finalize the file!

[Peter Parker]

Apart from the raised defect #3786, this seems to be working fine.

[Stuart Campbell]

This ticket has been transferred to github issue ​4402