Renamed dietz2011modulationfilter() to dietz2011modulationfilterbank()
Updated Dietz model to calculate only the desired values.

For this I added a 'noenv' option to disable the envelope modulation filter and
a 'nolowpass' option to disable the calculation of the *_lp interaural
parameters. Note, that ic is nontheless calculated even if we apply a lowpass
there.
Updated estimate_azimuth() to work with new syntax of dietz2011()
Added the new options of the dietz model to the corresponding arg functions
Updated exp_dietz2011() to work with new syntax of dietz2011()
Added a figure to the reference of dietz2011unwrapitd()