Meteor MN2 decoder for rpi 3B+

In the latest RPi image the flowgraph information has been moved to /var/lib/satnogs/lib/python3.7/site-packages/satnogsclient/radio/flowgraphs.py. To add the Meteor MN2 demodulation flowchart, add the following.

Add:
'LRPT': 'satnogs_meteor_lrpt_demodulator.py'
to the SATNOGS_FLOWGRAPH_SCRIPTS dictionary.
and

  'LRPT': {
        'script_name': SATNOGS_FLOWGRAPH_SCRIPTS['LRPT'],
        'has_baudrate': False,
        'has_framing': False,
    },

to the SATNOGS_FLOWGRAPH_MODES dictionary.

The satnogs-client needs to be restarted to adapt these changes, either by sudo systemctl restart satnogs-client or rebooting the Raspberry Pi.

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