spectrum.mmb~ has an undocumented dependency on "windowing"

[jamshark70]

Using Pd 0.50.0, and mmb in the search paths:

1. New patch.
2. Put array (let's just call it array1) with 512 samples.
3. Add [spectrum.mmb~ array1].

Pd console says:

 windowing/kaiser~
... couldn't create

And nothing displays in the plot.

Aha... now I find deken has a "windowing" external package.

Should this be mentioned in the readme?

[jamshark70]

Also a dependency on cyclone/count~ (in the logfreq part).