Remove scipy from iridium_extractor_flowgraph.py?

[jmfriedt]

Is the import scipy in
https://github.com/muccc/gr-iridium/blob/master/python/iridium_extractor_flowgraph.py
needed? I have removed it and the flowgraph seeems to run happily. Removing scipy removes a huge dependency for running gr-iridium on embedded boards (e.g. Raspberry Pi 4) running a Buildroot generated operating system.

[Sec42]

I seem to remember that it was needed for some debugging output/feature. Checking the git history I can't recall any details though. Maybe @schneider42 remembers something?

[schneider42]

This must be a leftover from the pure Python implementation. I'm going to remove it.

[schneider42]

Pushed the change directly to master. Thanks.