Diffractem

A small but important improvement: the automatic indexing scripts created by `tools.call_indexamajig` now automatically set the `HDF5_PLUGIN_PATH` variable such that the LZ4 encoding as used by diffractem can be understood.

In this version, the major change is the compatibility with the latest versions of CrystFEL (later than 0.9.1) which support electrons as first-class citizens. The workflow is much cleaner now, as "virtual" data files are now not needed anymore (CrystFEL natively accounts for variable beam centers).
There are also some minor new tweaks and fixes. Note that you'll need the latest example notebooks to go along with this version, as there were breaking changes.

Several new functions are included, especially regarding geometry/cell refinement and CrystFEL integration. Tested with the notebooks included in the submitted version of the workflow paper (available at https://github.com/robertbuecker/serialed-examples).

Probably the last release that keeps the peaks and predictions tables in the Dataset object and supports table-style HDF5 entries.

analyze_hkl is now not required anymore in the Jupyter notebooks

Fixes some missing dependencies during installation, and incompatibilities with newer versions of dask.