MPIfR suggestion batch

## Plots
- [x] Flexible plots (e.g. `Gal. latitude` vs `DM`); leave it to the user to judge whether a parameter combination makes sense
- [ ] Interactive plots

## Catalogue rows
- [ ] Redshift (progress: [`redshifts.py`](https://github.com/HeRTA/FRBSTATS/blob/main/redshifts.py))
- [ ] Localization area
- [ ] RM & polarization properties (frac. linear and circular)
- [ ] Scattering (temporal broadening and scint. bandwidth)

## Database
- [ ] FRB widths with 1e3-1e4 ms are dubious **(duplicate of #23)**

## Misc
- [x] \# FRB Source instead of FRB Count
- [ ] Association with catalogued sources within errorbox (galaxies, supernovae, X-ray sources etc.) - see: http://cdsxmatch.u-strasbg.fr
- [ ] Cross-reference positions and estimated redshifts of FRBs with the Nasa Extragalactic Database and find objects which could be potential sources