GPS improvements. SDR handling improvements.

Catch-up release, the below have been released and tested in previous betas:

• Interface improvements/fixes.
• RTL-SDR code improved. Single dongle can be assigned to UAT or 1090ES.
• GPS code improvements.
• AHRS improvements (AHRS still under development).
• Remove default route - shows "connected" faster on iOS.
• WAAS status on web interface added.
• Negative altitude error corrected.
• "reboot" and "shutdown" from web interface added.
• CPU utilization reduced by about half.
• Added new status message (WingX).
• Log handling improvements.
• 1090ES decoding bugfixes.

Bugfixes. GPS improvements. SDR handling improvements.

• Removed UAT SDR powersave.
• GPS code improvements (timezone, support for testing other GPS units).
• AHRS heading bug fix (AHRS still under development).

Bugfixes. GPS/AHRS improvements.

• Moved timing code away from Raspberry Pi clock - fixes uptime display and other issues when clock is shifted by GPS time.
• Shutdown/Reboot buttons moved to settings menu, functionality improved.
• GPS/AHRS code improvements (AHRS still under development).

GPS improvements. 1090ES decoding bugfixes.

• GPS date validation.
• AHRS heading/GPS fix (AHRS still under development).
• 1090ES decoding bugfixes.

AHRS improvements. Status update improvement. Power savings.

• Integrated library to make use of DMP "Digital Motion Processor" on MPU6050/MPU9150 - improved AHRS functions. (still in development).
• WingX/status update message changes.
• Fixed web interface bug.
• Integrated more power saving changes.

WingX compatibility improvements. Web interface features. Bugfixes.

• "reboot" and "shutdown" from web interface added.
• WAAS status on web interface added.
• Negative altitude error corrected.
• CPU utilization reduced by about half.
• Added new status message (WingX).
• Log indexing added (creates new log files for each use).
• Logfile compression added - default on (-developer flag added for plaintext logs).
• UAT replay feature merged into gen_gdl90 and improved.

Improved tuner dongle code. Bugfixes.

• RTL-SDR code improved. Single dongle can be assigned to UAT or 1090ES. needs testing
• Don't set a default route - shows "connected" faster on iOS.
• Interface improvements/fixes.

Bug fixes

• Fixed a stability issue affecting some SDRs and configurations.

Bug fixes

• Fixed RPi lockup issue that required some users to hard-reset the device.
• Automatically set time when GPS is connected.
• Misc. stability improvements.
• Web interface improvements - AHRS testing display and bug fixes.
• 1090MHz only mode (978MHz only is still default - change in settings).
• Configurable 978MHz tuner (advanced).

To permanently set one tuner to be preferred for 978MHz, connect only that tuner (no others), log in and do the following as root:

 rtl_eeprom -d 0 -s stratux:978

v0.4r2 - stability fixes

• Fixes stability issue in v0.4r1 (disconnects/lockups).
• Remove port 43211 from defaults.