Complete the set of mask types in the mask tab

[mdoucet]

This issue was originally TRAC 3310

This is a follow up to ticket http://trac.mantidproject.org/mantid/ticket/2819. The set of mask types is incomplete. It's often useful to have the inverse of the disk and rectangle (mask everything but the selected region).

Also, it would be less confusing if the default tool selected would be the disk or rectangle mask, not the "move detector" tool. In addition, the response of the "move detector" tool is much too sensitive. One small move of the mouse and the whole detector is gone out of view.

[mdoucet]

@NickDraper (2011-09-19T09:30:37):
Bulk move of tickets to iteration 31 at the iteration 30 code freeze

---

@NickDraper (2012-01-09T09:42:53):
Moved to iteration 33 at iteration 32 code freeze

---

@NickDraper (2012-04-30T14:12:00):
Moved at end of release 2.1

---

@NickDraper (2012-08-10T12:43:23):
Moved at the end of release 2.2

---

@NickDraper (2012-10-28T11:38:37):
Moved to milestone 2.4

---

@NickDraper (2013-01-28T09:22:51):
Moved at the code freeze for release 2.4

---

@NickDraper (2013-04-29T09:49:32):
Moved to r2.6 at the end of r2.5

---

@NickDraper (2013-07-26T13:54:58):
Moved to backlog at the code freeze for R2.6

---

@NickDraper (2014-02-14T11:04:55):
Bulk move to assigned at the introduction of the triage step