Create a measuring tool for the instrument view.

[mantid-roman]

This issue was originally TRAC 4994

The idea is that you click on one peak, its location is stored, then click on another and it will give you the difference in 2 theta, in phi between the two but most importantly it will calculate the angle between the two q-directions defined by these two points (the reason for this is that it can then be directly checked against the results of the print u.recAngle command). This is very useful when the crystal is not aligned. If it is aligned, this angle is either 2 theta (which we can read by doing a difference)/2 or phi, depending if your peaks are along a horizontal or vertical direction but if you look at non-orthogonal reflections or misaligned sample, it is no longer the case.
Pascal.

[mantid-roman]

@NickDraper (2012-04-30T14:13:06):
Moved at end of release 2.1

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

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@NickDraper (2012-10-28T11:38:54):
Moved to milestone 2.4

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@NickDraper (2013-01-28T09:23:04):
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

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