Slice viewer image should display missing, lowest and missing points in different colours

[abuts]

This issue was originally TRAC 5297

This question come from IS feedback and I completely agree with the point.

Current slice viewer cuts the points with image intensities from lower and upper limits and replaces everything with single colour (white)

this substantially reduce the image quality in comparison with e.g. Mslice, which displays missing points and points rejected by lower and higher intensity in different colours.

Another (less important) enhancement may be possibility to select more traditional colour scale.

[abuts]

@NickDraper (2012-08-10T12:43:47):
Moved at the end of release 2.2

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@NickDraper (2012-10-28T11:38:58):
Moved to milestone 2.4

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@NickDraper (2013-01-28T09:23:07):
Moved at the code freeze for release 2.4

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@NickDraper (2013-04-29T09:49:42):
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 (2014-02-14T11:04:57):
Bulk move to assigned at the introduction of the triage step

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