Pyp-beagle

- Removing unsupported 'papertype' option from matplotlib fig.savefig method
- Update README.md

- Bug fix: an issue was introduced when adding support for the MAP solution in the summary catalogue, this fix closes 51
- Bug fix: correctly dealing with log flux scale in the presence of negative or zero fluxes

- Raise error whne unable to match object IDs and input spectra
- Allow post-processing of spectra with redshift as an adjustable parametter, i.e. the redshift column can contain different values
- Defining backend when on Mac OS

- Adding some logging messages to ease debugging

- Added new fields to the summary catalogue: the MAP value for each parameter, and the probability, likelihood and chi_square corresponding to the MAP solution. Also added the number of data points used in the fitting to ease the calculation of a pseudo reduceed chi_square. Closes 49
- Added command-line options to overwrite existing files and to flatten the columns in the output FITS files
- Replacing deprecated Astropy FITS clobber keyword, fixes 50

- Fixing plotting of full SED (spectrum) on marginal plots for photometry. Units conversion (F_lambda to F_nu) was wrong (a regression that appeared at some point). Fixes 47
- Remove Matplotlib deprecated option (see https://matplotlib.org/3.3.1/gallery/text_labels_and_annotations/usetex_baseline_test.html), fixes #48