update_check proc consolidates update checking

* version bump to 1.16

* command line argument reporting fix
Keep event loop alive even while updating software

* ADS-B messages can still be processed while external programs are being run and the output echo'ed to the adept server.
Fetch https URLs from FA using tcllib's http

...rather than wget.
Minor remote update fixes.  Almost there.
Add new piaware -v argument to emit version & exit
Merge branch 'dev' of github.com:flightaware/piaware into dev
Make dump1090 restart logic more robust
Add -debugport to specify ip console to piaware.

Plus fix some formatting issues.
Require the Itcl package from the piaware package
Make piaware -v version only emit version, no fluff.
Better IpConsole integration

* Use piaware "logger" function for logging
Rework problem detection and restart logic

* Be willing to start dump1090 if it's not running after a fairly long while

* Allow /etc/init.d/*dump1090* startup type (restart, start) to be specified

* Cancel prior timer events for scheduling FA-style port connecting

* Rename faup1090_messages_being_received_check to adsb_messages_being_received_check

* Add new -debugport option to allow localhost telnetting to Tcl interpreter for poking around and debugging.