Update to 2.90.

* Fri Dec 4 2009 Eric S. Raymond <esr@snark.thyrsus.com> - 2.90
  GPSD-NG, the new JSON-based command protocol, is now deployed; as a
  consequence, AIS is now fully supported in both daemon and client.
  Detection of end of a fix-reporting cycle is now reliable;
  accordingly data is accumulated from cycle start and the "J"
  (nojitter) opoption on both server and client side is gone. We have
  abandoned the gpsflash subproject since it has become apparent that
  we can't do it without more vendor cooperation than we're likely to
  get. Increase major version of shared library due to significant API
  change. Added new driver for Motorola Oncore receivers, with help
  from H虧an Johansson. gpsfake can now accept multiple logfiles,
  interleaving test sentences from each.  gpsd now accepts error
  estimates from the NMEA $GPGBS sentence.

(gdt)