Allow browing by the intrument tree in the instrument window

[Nick Draper]

Provide a tab showing a tree view of the instrument and allowing people to zoom to sections of the instrument by selecting from the tree.

The view should be placed in between the sample position and the selected item (could be a whole bank) such that the whole of the selected item takes up most of the screen.

Obviously you will have exceptions for this for the sample itself and the whole instrument.

[Sri Nagella]

(In [1681]) refs #292 Added Instrument tree widget

[Sri Nagella]

(In [1682]) refs #292 Added Instrument tree widget, forgot to add classes

[Sri Nagella]

(In [1700]) refs #292 1) Added functionality to the Instrument tree 2) Modified to save colormap settings

[Sri Nagella]

(In [1776]) refs #292 Fixed error in the InstrumentTreeWidget getSamplePos method which assumes a sample.

[Sri Nagella]

(In [1777]) refs #292 Fixed display errors and enhancements so that the view when group of detectors is selected is from the center

[Sri Nagella]

(In [1782]) refs #292 Fixed problem with the Object without any rule or empty object Fixed the normals generated for GtsSurface

[Sri Nagella]

(In [1783]) refs #292 Problem with empty object bounding box throws exception in linux

[Sri Nagella]

(In [1784]) refs #292 Problem with empty object in ObjComponent while rendering

[Sri Nagella]

(In [1809]) refs #292 Fixed error in quat which locked the view when rotated around zaxis. Enhancement in the view

[Stuart Campbell]

This ticket has been transferred to github issue ​1140