Let the user fine tune stretching values in raster properties/style

[qgib]

Author Name: alobo - (alobo -)
Original Redmine Issue: 6188

Redmine category:rasters

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When the user selects Use standard deviation and selects
a value for the sd, the calculated min,max values are greyed
and cannot be modified. If the user then selects Custom min/max values,
the previously calculated values are erased. This used not to be
the case in previous versions.
Min/max values calculated from sd ranges are very useful as a first
guess, but very often must be fine tuned. Thus not erasing the calculated values
is an important aid.
A critical case is when
color composites of several images must be compared, as all of them
must have the same stretching.

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• fixed_version_id was changed from Version 1.8.0 to Version 2.0.0
• operating_system was changed from all to

[qgib]

Author Name: Pirmin Kalberer (Pirmin Kalberer)

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• fixed_version_id was changed from Version 2.0.0 to Future Release - Nice to have

[qgib]

Author Name: Alexander Bruy (@alexbruy)

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Seems works in master

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• status_id was changed from Open to Feedback

[qgib]

Author Name: Paolo Cavallini (@pcav)

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Closing for lack of feedback - please reopen if necessary.
Thanks.

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• priority_id was changed from High to Normal

[qgib]

Author Name: Paolo Cavallini (@pcav)

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• status_id was changed from Feedback to Closed

[qgib]

Author Name: alobo - (alobo -)

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Tested with 1.9 on Mac: works fine