v0.7.0

Bugfix: properly account for masked regions during the Petrosian radius calculations.

This change directly affects measurements of the Petrosian radius in masked images (usually resulting in slightly larger radii), and indirectly affects other quantities that depend on the Petrosian radius, such as the Gini-M20 and CAS parameters.

However, the effect is very small in most cases. For example, even in the extreme case of the heavily masked BCG+ICL synthetic images presented in Montenegro-Taborda et al. (2025b), the Petrosian radii increased by 6%, on average, after this change. The impact should be smaller than this in most situations, especially for "normal" galaxies with a moderate amount of masking. Unmasked images are unaffected by this change.