Reorganization and adding of fitting for extinction: - Reordered some functions. - Added two ways of fitting the extinction to the input data. - If law='mcclure', it will now use Mathis for AV<3.
Reorganization and adding of fitting for extinction:
- Reordered some functions.
- Added two ways of fitting the extinction to the input data.
- If law='mcclure', it will now use Mathis for AV<3.

cespaillat/EDGE,cespaillat/EDGE