Updates from David Megginson:

Updates from David Megginson:

1. I've modified src/Time/fg_time.cxx so that the --start-date-gmt
option works correctly, at least on my system.

2. I've modified src/Main/bfi.cxx to return the correct time from
FGBFI::getTimeGMT(), so that saving and reloading now keeps the time set
correctly again.

3. I've modified src/Main/main.cxx so that the engine still makes a
noise when it's idling (it sounded very strange when the engine simply
turned off at idle then magically turned on again with a little
throttle).