Make FileEventDataListener handle event files

[Michael Reuter]

The FileEventDataListener should be able to handle event NeXus files as well as the current types of files. Restructure the code a bit to make this possible while being agnostic to the file name as much as possible.

[Michael Reuter]

Refs #8092. Making loader finding not depend on filename parsing.

Changeset: 334a60aa2dd51bb4c13d919ab17437411a39bf76

[Michael Reuter]

Refs #8092. Whitespace fixes.

Changeset: 49871198f2b0a8d26fc6e4dadb2a3ad25b1433d3

[Michael Reuter]

The branch can be found ​here.

To test: Set the following properties in your Mantid.user.properties file:

• fileeventdatalistener.filename
• fileeventdatalistener.chunks

With a filename pointing to an event NeXus file. This can be done at SNS using the new ADARA (*.h5) NeXus files. You can also try Pre(Event)Nexus files as well, but the unit test covers one of those cases. Make sure the unit test works.

[Russell Taylor]

Merge remote branch 'origin/feature/8092_fileeventdatalistener_eventnexus'

Full changeset: ​0f5c9623e688382e2d023993237c23215952853f

[Russell Taylor]

As anticipated, the event build up in a pretty strange way for these files (a back at a time), which is why this originally targeted preNexus files. But since those are going away with ADARA, this change serves a purpose.

[Russell Taylor]

P.S. I agree that no additional unit test is merited as this is itself essentially test code.

[Stuart Campbell]

This ticket has been transferred to github issue ​8937