===================
Breaking Changes
----------------
* Move ``bluesky.scientific_callbacks`` to ``bluesky.callbacks.scientific``
and ``bluesky.broker_callbacks`` to ``bluesky.callbacks.broker``.
* Remove ``bluesky.register_mds`` whose usage can be replaced by:
``import metadatastore.commands; RE.subscribe_lossless('all', metadatastore.commands.insert)``
* In all occurrences, the argument ``block_group`` has been renamed ``group``
for consistency. This affects the 'trigger' and 'set' messages.
* The (not widely used) ``Center`` plan has been removed. It may be
distributed separately in the future.
* Calling a "SPEC-like" plan now returns a generator that must be passed
to the RunEngine; it does not execute the plan with the global RunEngine in
gs.RE. There is a convenience wrapper available to restore the old behavior
as desired. But since that usage renders the plans un-composable, it is
discouraged.
* The 'time' argument of the SPEC-like plans is a keyword-only argument.
* The following special-case SPEC-like scans have been removed
* hscan
* kscan
* lscan
* tscan
* dtscan
* hklscan
* hklmesh
They can be defined in configuration files as desired, and in that location
they will be easier to customize.
* The ``describe`` method on flyers, which returns an iterable of dicts of
data keys for one or more descriptors documents, has been renamed to
``describe_collect`` to avoid confusion with ``describe`` on other devices,
which returns a dict of data keys for one descriptor document.
* An obscure feature in ``RunEngine.request_pause`` has been removed, which
involved removing the optional arguments ``callback`` and ``name``.