Improve editing of mask shapes in instrument view

[mantid-roman]

This issue was originally TRAC 6739

Request from Pascal

1. Copy and paste mask between instrument views
2. Increase precision of in the shape property browser

[mantid-roman]

@NickDraper (2013-04-29T09:49:59):
Moved to r2.6 at the end of r2.5

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@NickDraper (2013-07-26T13:55:01):
Moved to backlog at the code freeze for R2.6

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@NickDraper (2014-02-14T11:04:59):
Bulk move to assigned at the introduction of the triage step

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