Allow use of Instrument view outside MantidPlot

[stuartcampbell]

This issue was originally TRAC 1390

Make the instrument view available outside !MantidPlot (i.e. from vanilla python)

[stuartcampbell]

@NickDraper (2010-12-16T09:49:24):
Bulk move of tickets to iteration 27, if your ticket is essential for Iteration 26 then move it back.

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@NickDraper (2011-02-15T09:09:30):
Bulk move of tickets at the end of iteration 27

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@NickDraper (2011-04-27T07:35:58):
Bulk move of tickets at the end of iteration 28

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@NickDraper (2011-06-27T08:23:28):
Accepted and assigned tickets moved at iteration 29 code freeze

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@NickDraper (2011-09-19T09:30:50):
Bulk move of tickets to iteration 31 at the iteration 30 code freeze

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@NickDraper (2012-01-09T09:43:26):
Moved to iteration 33 at iteration 32 code freeze

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@NickDraper (2012-04-30T14:13:49):
Moved at end of release 2.1

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@NickDraper (2012-08-10T12:44:00):
Moved at the end of release 2.2

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@NickDraper (2012-10-28T11:39:12):
Moved to milestone 2.4

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

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@NickDraper (2013-04-29T09:50:00):
Moved to r2.6 at the end of r2.5

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@mareuter (2013-05-13T14:52:15):
As evidenced by this [http://www.mantidproject.org/Instrument_View_Control page], this request can be done.

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@stuartcampbell (2013-05-13T15:17:35):
It can be done from python within MantidPlot - but not from Python outside of MantidPlot

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@NickDraper (2013-07-26T13:55:02):
Moved to backlog at the code freeze for R2.6

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@NickDraper (2014-02-14T11:07:56):
bulk move to assigned at the into of the triage step

[rosswhitfield]

Fix in #23789