fg_time.cxx: Removed call to ctime() in a printf() which should be harmless

fg_time.cxx: Removed call to ctime() in a printf() which should be harmless
  but seems to be triggering a bug.
light.cxx: Added code to adjust fog color based on sunrise/sunset effects
  and view orientation.  This is an attempt to match the fog color to the
  sky color in the center of the screen.  You see discrepancies at the
  edges, but what else can be done?
sunpos.cxx: Caculate local direction to sun here.  (what compass direction
  do we need to face to point directly at sun)