Rewrite 'net' command by a new code using WS2P

get rid of net command in the meanwhile as it is completely broken if bellow implementation is not ready for an next release:
- BMA: /network/ws2p/heads
- WS2P: DuniterPy implementation: duniterpy#58 (closed), duniterpy!84 (merged)

Edited Jun 08, 2020 by Moul

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