wip, arducopter hil model and protocol
linux speech synthesis: switch to eSpeak

Conflicts:
	QGCExternalLibs.pri
	src/GAudioOutput.cc
Added 2 kPA offset to pressure measurements to get HIL closer to real conditions
Fixed wrong location of offset constant
flightgear: add configurable barometer offset
Merge remote-tracking branch 'upstream/master' into espeak

Conflicts:
	QGCExternalLibs.pri
	src/GAudioOutput.cc
	src/GAudioOutput.h
remove alsa asound library dependency comment
fix merge errors and unused-variable error
QGCMessageView: Extensive code cleanup and bug fixing.
Right-click menu works cleaner.
Coloring of output text is correct.
Output text now handles all severities of messages.
QGCMessageView: Added timestamps.
Message view: Forgot to remove debugging output.
Google earth: Corrected #ifdef for Google Earth-specific code.
Merge branch 'master' of github.com:mavlink/qgroundcontrol into message_view
Simplified formatting
message view improvements
Fix failed connect

There is no such things as a clicked signal on QWidget. You activate
new UAS from right-click menu.
Fix failed connect

showLabel was connected to signal but not set as a slot
Fix failed connection

MainWindow::loadDataView has been commented out for 9 months now.
Removed commented out code instead of leaving cruft in.
Commented out uneeded debugging output
Silence some queued signal warnings