Enable help2man for LAL
This MR enables
help2man for LAL, and improves the formatting of the --help messages for
lal_simd_detect to provide useful-ish manual pages.
API Changes and Justification
Backwards Compatible Changes
- This change introduces no API changes
- This change adds new API calls
Backwards Incompatible Changes
- This change modifies an existing API
- This change removes an existing API
If any of the Backwards Incompatible check boxes are ticked please provide a justification why this change is necessary and why it needs to be done in a backwards incompatible way.