moved model fit from cli to the main module
refactors

refactored argument names in modules (may break saved trained models)
changed optimization method for inversion.

refactored main
changed decorator signature.

changed function signatures in diffusion models, change models, summary measuremnets

added run parallel

removed unnecessary functions

updated signature of the diffusion models (removed all the default parameter values)

changed lmax to shm_degree
added check for having enough directions in each shell

check if sigma_n is singular.

remove generated deformation field after using it.
added a parallel flag for inference.