Bruker XRF

[ericpre]

Add support for XRF bruker file as described by @ffsedd and speed up setting conda environment by removing unnecessary dependencies.

Progress of the PR

• Add support for XRF bruker file as described in Bruker M6 Jetstream SPX file type not supported #2689,
• Remove pyusid from azure pipeline, because it is pulling dask and we only need dask-core,
• Use matplotlib-base instead to installing qt on azure pipeline
• exclude dask-core 2021.3.1 because the package on anaconda channel is broken, conda-forge is fine - see Fix dask 2021.3.1 AnacondaRecipes/dask-core-feedstock#1, once this is fixed, we can remove the pin.
• add entry to CHANGES.rst (if appropriate),
• add tests,
• ready for review.

[codecov]

Codecov Report

Merging #2694 (fcab16b) into RELEASE_next_patch (64698e6) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@                 Coverage Diff                 @@
##           RELEASE_next_patch    #2694   +/-   ##
===================================================
  Coverage               76.93%   76.94%           
===================================================
  Files                     201      201           
  Lines                   29706    29711    +5     
  Branches                 6513     6515    +2     
===================================================
+ Hits                    22854    22860    +6     
  Misses                   5105     5105           
+ Partials                 1747     1746    -1     

Impacted Files	Coverage Δ
hyperspy/io_plugins/bruker.py	88.81% <100.00%> (+0.24%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 64698e6...fcab16b. Read the comment docs.

[sem-geologist]

I don't know what goes with azure and matplotlib, but bruker side looks good to me;
Albeit, I wish there some note would go somewhere in the hyperspy metadata that this is not electron based EDS but X-ray excitation based EDS. (As Far I can remember there was some PR/issue to make new signal for XRF)

[ericpre]

Thanks @sem-geologist for the review, indeed the metadata needs some changes!