Remote GPS source retry

[Nick Taylor]

Hi Gary et al

You may recall the change here to add retry for ntrip & tcp connections

3.24: 2022-04-22
NTRIP 2.0 now works. But still only plain HTML, not RTP, etc.
Remove ntrip option and NTRIP_ENABLE. Always build.
Remove passthrough option and PASSTHROUGH_ENABLE. Always build.
Remove nmea0183 option and NMEA0183_ENABLE. Always build.
Remove netfeed option and NETFEED_ENABLE. Always build.
gpsd will retry ntrip:// and tcp:// connections
cgps can expand to show more sats. Added --rtk option.
maidenhead() checks for input errors.
Better SHM logs.


We have a new site where customer is running gpsd so we are experimenting now 
using gpsd:// connection - is there any reason why this can't also have the 
retry?

Currently it seems to fail if the remote feed is down when local gpsd starts up 
and we need to restart gpsd in order to get the feed working.

Thanks and regards

Nick