add SOFAresample function

[davircarvalho]

adds resampling function for SimpleFreeFieldHRIR and demo code

[isfmiho]

Thank you Davi, can I set both files to EUPL license?

I would adapt the headers as well, to keep a consistent format.

[davircarvalho]

Sure sure I forgot to include it, feel free to modify before accepting the pull request

[petibub]

Hi David, thanks for providing SOFAresample. Works like a charm!
A question: why did you include the post-hoc filtering? This makes SOFAresample to SOFAresampleAndFilter somehow...
Can we remove the filtering such that potential users do that filtering post hoc by themselves? Or, do you use it widely in your applications (then, I'd prefer to have the filtering selected by a flag)?

[davircarvalho]

@petibub this is how I normally use this function, my thought in leaving the filtering was to avoid undesirable artefacts for less experienced users and students. I agree it makes sense to leave it as an optional flag though

[petibub]

Ah, I understand. What that be OK to have flags 'scale', 'noscale', 'filter', 'nofilter' with 'scale' and 'nofilter' as defaults?