Allow passing extra channel rendering options to Make_Movie script (see #12037)

Reusing the Channel keyword argument, now accepting a list of strings instead of a list of integers. Backward compatible with the previous format of channel ids (1 based) to turn on exclusively.
ex: Channels=2,3

Extended the accepted format to allow for passing channel window range and color, with the format 'idx|min:max' having both '|min:max' and '' optional, but when both are present order must be respected.
ex: Channels=2|0:250,3|50:100
Small tweaks to make flake8 happy
Fix last flake8 warning
revert Channels arg to Make_Movie and add new ChannelsExtended
Fixing check for valid channels to handle both Channels and ChannelsExtended
merge dev_4_4 -D org: PR 67 (Allow passing extra channel rendering options to Make_Movie script (see ...)
merge dev_4_4 -D org

Repository: ome/scripts
Updating bef5c0c..4e28e22
Merged PRs (fast-forward):
  # PR 74 sbesson 'Fix scripts to comply with PEP8 1.5.0 (rebased onto dev_4_4)'
  # PR 65 sbesson 'Drop --use-mirrors from .travis.yml (rebased onto dev_4_4)'

Merged PRs:
  # PR 67 cneves 'Allow passing extra channel rendering options to Make_Movie script (see ...'

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