v0.1.17

The spectrum and response classes in the data module can now be treated as "models", meaning they are capable of defining free parameters and participating in fitting procedures. This functionality gives rise to two application scenarios:

I: When the exposure times associated with spectrum and response require correction, a free multiplicative factor can be applied to adjust the exposure time during fitting.

II: In cases where the response depends on unknown right ascension (RA) and declination (Dec), these coordinates can be treated as free parameters in the fitting process, thereby enabling source localization.

These enhancements come at the cost of a modest increase in computational overhead, as variables derived from spectrum and response must now be dynamically updated in response to parameter changes.