Investigate file Backing Option Suggested By R. Ewings

[OwenArnold]

This issue was originally TRAC 4784

From R.Ewings feedback on Vates testing: "If you do not have enough memory to load an sqw file, and go ahead anyway without file backing, MantidPlot crashes. Can’t we add a catch which stops this happening?"

Can something, if anything, be done about this?

[OwenArnold]

@NickDraper (2012-04-30T14:13:00):
Moved at end of release 2.1

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@NickDraper (2012-08-10T12:43:40):
Moved at the end of release 2.2

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@NickDraper (2012-10-28T11:38:51):
Moved to milestone 2.4

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@NickDraper (2013-01-28T09:23:02):
Moved at the code freeze for release 2.4

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@NickDraper (2013-04-29T09:49:40):
Moved to r2.6 at the end of r2.5

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@NickDraper (2013-07-26T13:54:59):
Moved to backlog at the code freeze for R2.6

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@NickDraper (2014-02-14T11:04:56):
Bulk move to assigned at the introduction of the triage step

[OwenArnold]

For samuel

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