JOSS paper: State of the field

[jdmoorman]

Please discuss in the JOSS paper how this software compares to other commonly-used packages in the field. In particular, be sure to explain

• [x] how SPOD compares other SVD based techniques and
• [x] how PySPOD compares to other SPOD packages.

A brief search for SPOD implementations turned up the following:

• https://gist.github.com/loiseaujc/dd3739fa779d7bdd678639ae7396a73b
• https://github.com/tjburrows/spod_python
• https://github.com/SpectralPOD/spod_matlab

[jdmoorman]

openjournals/joss-reviews#2862

[mengaldo]

@jdmoorman This has been addressed. Thank you.