SANS: Implement an option for summing in multi-period reductions

[NickDraper]

sans_feature
This issue was originally TRAC 2149

Allow users to enter a period string like

 1-4,4,5,6-9

This would mean

Sum periods 1-4 and process as a single period
process periods 4 and 5 individually
sum 6-9 and process

This should work in script commands and the UI (single and batch mode).

[NickDraper]

@NickDraper (2011-02-15T09:09:32):
Bulk move of tickets at the end of iteration 27

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@NickDraper (2011-04-27T07:36:01):
Bulk move of tickets at the end of iteration 28

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@NickDraper (2011-06-27T08:20:26):
"New" tickets moved at the code freeze of iteration 29

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Steve Williams (2011-07-29T14:46:08):
In GUI when clicking on multiperiod tick box extra boxes appears. Allow new string commends there. Implementation will likely consist of creating a batch like run behind the scene.

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@NickDraper (2011-09-19T09:30:54):
Bulk move of tickets to iteration 31 at the iteration 30 code freeze

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@NickDraper (2012-01-09T09:41:56):
Moved to iteration 33 at iteration 32 code freeze

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@Anders-Markvardsen (2012-04-11T08:29:03):
Added additional comments to isis sansbatch python. re http://trac.mantidproject.org/mantid/ticket/2149
9662985

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@Anders-Markvardsen (2012-04-11T09:09:54):
Steve writes:

If so, then we think that will suffice now – meaning the priority of this job could be decreased - because: SANS2D is now running event mode and so is unlikely to use periods again, LOQ doesn’t use periods very often, LOQ can’t generate as many periods as SANS2D, LOQ wouldn’t normally use such short periods as SANS2D (that were the driver behind the p6-9 type of summation), and LOQ will be converting to event mode before too long.

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@Anders-Markvardsen (2012-04-11T09:11:23):
When/if this ticket is completed then also update the systemtest committed in http://trac.mantidproject.org/mantid/ticket/5086

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@Anders-Markvardsen (2012-04-11T09:16:22):
Finally for now I should say that the steps to complete this ticket could be

1. Extend SANSadd2.py to also be able to add periods of the same datafile

2. Use this extended SANSadd2.py in SANSBatchMode.py::read_run()

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@NickDraper (2012-04-30T14:16:00):
Moved at end of release 2.1

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@NickDraper (2012-08-10T12:45:18):
http://www.mantidproject.org/Release_Notes_2_2_Full_List

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@NickDraper (2012-10-30T09:19:09):
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 (2014-02-14T11:07:58):
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

[Matthew-Andrew]

I am closing this now and will recheck with scientists on whether it is still needed.