from v1.06 of general:
=====================

In my_DSP_modules.py,

(*) Added a new function fft_filter which can filter multi-dimensional input data
using the frequency domain representation of the input using frequency weights
with passband options being 'low' or 'high'

In my_operations.py,

(*) added a customizable function to estimate root mean square value of an input
with multiple dimensions which can apply frequency domain filtering and/or
mask before estimating standard deviation.
(*) in function reverse(), changed default of ind_range from [-1, 1] to None
because there seemed to be a bug where ind_range from previous call seemed to
copy over to the next call. Still needs to be udnerstood why this was happening.
Changing the default to None seems to eliminate this unexplained carryover.

In lookup_operations.py,

(*) Added a keyword maxNN to populate only the maxNN nearest neighbours with
nearest neighbour values