Fixed indentation.
Ignore *.mov, *.nef & *.out files.
Also allow NEFs as source images.
Check return status of -[QTMovie updateMovieFile].
Assorted improvements.

• Removed unnecessary pre-declarations of local variables.
• Made local variables const where appropriate.
• Always draw into an intermediate buffer, regardless of whether
resizing is in play or not.  This seems to help work with NEFs better.
• Added additional error checking and logging.
• Added a warning message if any frame in the movie exceeds 2,512
pixels in height; experimentation has shown that this will break the
output movie.
Removed now-unnecessary hard limit on resize height of 1080.