Video Summary

This pull should:
-Add time stamps to fits file headers in sunDemo
-Add a program (AspectTest) for review of aspect processing code behavior on sets of png or fits files
-Add a program (AspectVideo) to generate videos of frame sequences
-Change the behavior of Aspect::Run() to report kind of error
-Change sunDemo to update only valid from Aspect::Run(). At the moment processing thread doesn't alert other threads as to what is/isn't valid.

Should address issues #81 #75 #66 #61 #58