Add statement of need

Merge pull request #31 from barbagroup/hotfix-0.1.1

Hotfix 0.1.1 -- Downgrade yaml-cpp

Merge pull request #29 from barbagroup/develop

Prepare for JOSS submission

[bug-fix] Read fluxes in ascii, not binary

Compatible with CUSP-0.4.0

Set rel and abs tolerances through cli AND input file