Log RFS error at DEBUG.
Renamed 'Greyscale' to 'Grayscale'
Moved ROI count to general metadata panel
Show colorpicker where the click happened
Merge pull request #3008 from sbesson/omero_src_flake8_2

OmeroPy: src flake8 (II)
flake8: omero/util - __init__
flake8: omero/util - cleanse
flake8: omero/util - concurrency
flake8: omero/util - decorators

The timeit function states in its comment that it logs at DEBUG. It didn't.
In order to fix both flake8 and the function self-_level needs to be
logging.DEBUG
flake8: omero/util - figureUtil
flake8: omero/util - remove goodeval

This file is not used anywhere.
flake8: omero/util - imageUtil

This file was a pretty awful mix of spaces and tabs. Thus much of the
flake8 fixes are whitespace changes, the diffs are not helpful.
flake8: omero/util - import_candidates
flake8: omero/util - importperf
flake8: omero/util - move mpfit and change only import
flake8: omero/util - OmeroPopo
flake8: omero/util - originalfileutils
flake8: omero/util - pixelstypetopython
flake8: omero/util - populate_metadata
flake8: omero/util - populate_roi