render.py: new CLI plugin for dealing with rendering settings (rebased onto develop)

[joshmoore]

This is the same as gh-4385 but rebased onto develop.

---

See the bin/omero render -h output and the test for expected behavior. Primary driver for the creation of render.py was scripting the rendering settings along with the imports so that everything could be re-done if necessary:

PLATE=$(bin/omero import ... | grep Plate:)
bin/omero render copy Image:1 $PLATE

• https://gist.github.com/emilroz/3858429bccd3012bf478

[joshmoore]

--rebased-from #4385

[jburel]

in the rest of code/doc we use rendering settings not rendering definitions

[joshmoore]

Merged in develop to fix travis.

[manics]

RFE: omero render set Image:1234 ch1:<channelname>/<min>/<max>/<RGB> ch2:<channelname>/<min>/<max>/<RGB> ...

[manics]

Help doesn't work:

$ omero render copy -h
...
TypeError: unsupported operand type(s) for %: 'tuple' and 'dict'

[manics]

• fff2bcb adds editing of the rendering settings of images
• 0e77ab9 fixes the help message

[manics]

+ other commits on #4542

[joshmoore]

Closing in favor of gh-4542 for the moment.