gui: removed delete button on default stream panels for optical and electron microscopes
gui: SEM/Opt buttons switched place and small refactoring
gui: Stream addition only enabled for those types of views supported by the currently selected viewport.
gui: refactoring bug fix
Merge branch 'development'
gui: Added lens alignment control buttons
gui: Added lens alignment tab
comedi: fix depth of detector

not a big deal, but the histogram code was worried of not having a power of 2 as depth
gui: merge conflict resolved
gui: small improvement with colour management

Improve change_brightness() to support better dark or light colour: "blend" instead of adding.

remove dependency on StepColour(): all the usages can be move to change_brightness

add borders to the visualSliderRange window

don't change the colour of the visualSliderRange when disabled (but the borders of the window) -> easier to read

also improve SetRange of visualSliderRange to detect bad values of min/max and put less warnings.
gui units: add a few more black listed units which don't support SI prefix
gui img: compactHistogram now support histograms with a length not a multiple of the small length

it was annoying to crash whenever the depth is not correct.
Better just do it, and warn there is a problem.
gui: Added lens alignment tab components
gui: make it clearer when using float RGB vs int RGB

also provides conversion functions for both RGB types
gui: small fixes with the histogram/spectrogram display
Merge branch 'master' of vpn.delmic.com:odemis