SANS: Investigate SANS2D distances in Geometry tab

[Anders-Markvardsen]

sans_bugfix
This issue was originally TRAC 5698

During testing of http://trac.mantidproject.org/mantid/ticket/5268 it was found that the sample - detector
distances saved in canSAS do not match those displayed in
the geometry tab for SANS2D runs, at least as calculated using
0.001*sqrt(X^2+Z^2).

It is strongly believed that the distances save with canSAS are
correct.

This ticket: first make Richard/Steve of this discrepancy. If they
think there is something not right then fix this.

[Anders-Markvardsen]

@NickDraper (2012-10-28T11:42:56):
Moved to release 2.4

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@NickDraper (2013-01-28T09:23:36):
Moved at the code freeze for release 2.4

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@NickDraper (2013-04-29T09:50:09):
Moved to r2.6 at the end of r2.5

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@NickDraper (2013-07-26T13:59:11):
Moved to the Backlog after the code freeze for R2.6

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@NickDraper (2014-02-14T11:07:57):
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]

This ticket refers to the old GUI