Get rid of magics

[mrakitin]

/opt/conda_envs/collection-2018-2.1/lib/python3.6/site-packages/bluesky/magics.py:39: UserWarning: BlueskyMagics.positioners is deprecated. Please use the newer labels feature.
  warnings.warn("BlueskyMagics.positioners is deprecated. "

See https://github.com/NSLS-II-ESM/profile_collection/blob/master/startup/80-settings.py#L26-L53

[mrakitin]

xref https://3.basecamp.com/3733838/buckets/4066457/todos/1101777572

[mrakitin]

xref NSLS2/esm-xpeem-profile-collection#5.