Enable help2man for LAL

Description

This MR enables help2man for LAL, and improves the formatting of the --help messages for lal_version and 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.

Review Status

@adam-mercer