Tar1090 -- improved webinterface for dump1090-fa and readsb

[SoNic67]

This was discussed previously:

RSSI

-49.5 dBFS is a raw signal level of zero, so yeah, you will see this for aircraft where you are receiving only synthetic messages (anonymized mlat, mlat during the period after the aircraft has left your reception range but before the mlat server stops feeding you results)