SANS: Save the content of the UI to a user file

[NickDraper]

sans_feature
This issue was originally TRAC 2211

Allow users to save the content of the UI to a new user file.

We would have to think about how we keep the original notes & comments in the file. Perhaps the whole previous files at the end, all commented out? Or can you be more clever?

Possibly taking the original file as a base and editing the values in place (may be harder for mask lines).

[NickDraper]

@NickDraper (2011-04-27T07:35:42):
Bulk move of tickets at the end of iteration 28

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@NickDraper (2011-06-27T08:20:15):
"New" tickets moved at the code freeze of iteration 29

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@NickDraper (2011-09-19T09:30:19):
Bulk move of tickets to iteration 31 at the iteration 30 code freeze

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@Anders-Markvardsen (2011-11-02T15:06:06):
This one is not a current requirement from the SANS Excell spreadsheet. Hence, for now drop is priority to trivial

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@NickDraper (2012-01-09T09:45:07):
Moved to iteration 33 at iteration 32 code freeze

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@NickDraper (2012-04-30T14:16:01):
Moved at end of release 2.1

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@NickDraper (2012-08-10T12:45:19):
http://www.mantidproject.org/Release_Notes_2_2_Full_List

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@NickDraper (2012-10-28T11:42:49):
Moved to release 2.4

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@NickDraper (2013-01-28T09:25:16):
Moved at the code freeze for release 2.4

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@NickDraper (2013-04-29T09:50:12):
Moved to r2.6 at the end of r2.5

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@NickDraper (2013-07-26T13:59:12):
Moved to the Backlog after the code freeze for R2.6

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@NickDraper (2014-02-14T11:07:59):
bulk move to assigned at the into of the triage step

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@NickDraper (2014-03-07T16:20:31):
Ownership handed over to Peter

[AntonPiccardoSelg]

Alternatively we could save the states in a file (which we currently do in the Diagnostic Tab). Then we can load these states. We just need to tweak our deserialisation a bit. Should be doable.

Writing the settings into a user file seems more involved. If this is the way the users want to go ahead however, then we should not start work on this before we have designed and implemented the new user file format

[Matthew-Andrew]

This is highly likely to be implemented during the joint reflectometry/SANS user file update detailed here #18826

[gemmaguest]

Replaced by #18826