[Halld-physics] Slides for PWA9/ATHOS4

[Alexander Austregesilo]

Dear Colleagues,

I updated the slides for the ATHOS/PWA workshop according to the 
received comments:

https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=3247

I also added the source code with all plots to the DocDB. It features 
the beamer theme that was inspired by the JLab Graphic Identity 
Standards and Style Guide*.

Additional comments and suggestions are welcome.

Thanks,

Alex


*https://www.jlab.org/div_dept/dir_off/public_affairs/logo/BrandingStandards.pdf