Shorten too long names

Some times names get very long when being explicit, this becomes a problem, when both a function name and the name of a parameter are long. It isn't necessary to have the same explicit part on the function and on the variable, here an example:

• calculate_lambda_from_profile(*, common_envelope_option_for_lambda=*) is already 70 characters and therefore effectively unusable without a line break.

What we could do:

• use acronyms, e.g. CE instead of common_envelope,
• use shorter words, e.g. get instead of calculate
• only use needed prepositions

Surly, don't cut all names down to bare minimum, it's more about getting the longest a bit shorter.