Replace spheroidal by taper throughout the code
The prolate spheroidal wave function (pswf) is a good choice for the taper.
Throughout the code the taper is passed around by the argument
taper is a better name for an argument allowing to use different tapers, which could be the pswf or 'spheroidal', but also something else.
The following discussion from !59 (merged) should be addressed:
Ah, the type is renamed. This applies to one of my general comments on this MR about not being able to run the Python examples. It is probably a matter of simply replacing all occurrences of
tapertype. Maybe we need to rename