Implementation of the Heracles command line interface (CLI). The CLI is meant to make it quick and easy to perform a "standard" analysis of catalogues, that is: obtaining angular power spectra, mixing matrices, and eventually jackknife covariances.

The CLI uses a configuration file (default file name heracles.cfg), of which an example is provided in the examples/ folder.

The analysis itself uses a series of commands that build up e.g. angular power spectra:

heracles alms myalms.fits
heracles spectra myspectra.fits myalms.fits
heracles mixmats mymixmats.fits myalms.fits

The following commands are currently implemented:

• maps -- create HEALPix maps from catalogues
• alms -- compute spherical harmonic coefficients (alms); either from catalogues or pre-computed maps
• spectra -- compute angular power spectra from alms
• mixmats -- compute mixing matrices

There is help available for every command (heracles <cmd> -h).

Closes: #56