Breaking changes

Extinction profile combination refactor
The extinction profile combination is no longer implemented as a method of MolecularProfiles.
It has been refactored into a standalone utility function, making the functionality more flexible and reusable.
This change allows combining extinction profiles corresponding to different atmospheric extinction mechanisms, produced via different tools,  as long as they are provided in ECSV or astropy.table.Table format.

Enhancements

Enhanced timeseries and statistical analysis functionality
Added support for handling single-level variables (e.g., ground temperature).