more lines, notebook edits, recursiveness

[tdiazsantos]

• Added more H-recombination and atomic lines.
• Modified release notebooks IIZw096_MIRI_spec_CAFE and _CRETA to accommodate new directory structure (and add example of new feature for recursiveness; see below), as well as modified NGC7469_NIRSpec-MIRI_test_cube for Thomas.
• Recursiveness: It is now possible to use the best parameters of a previous fit (via its parameter cube) to initialize the parameters of a new one
• Found a bug setting up the initial parameters for gaussian opacities. Nothing critical, they were just larger than specified in the file table. The fit should have converged nevertheless to the best value, although it would have taken more time.