#2 File name parsing error and a few quirks

[Paul Macklin]

Hello. Nice utility, but I've noticed a quirk.

If the file names include lots of 0's for padding, the
program returns a fairly uninformative error
"unsuccessful". Here are some sample file names:

frame000000.bmp
frame000001.bmp
frame000002.bmp
frame000003.bmp
frame000004.bmp
frame000005.bmp
frame000006.bmp
frame000007.bmp

Although these are well within your 10,000 frame limit,
they don't seem to be parsed properly. (If I rename
some of the files to

frame0001.bmp
frame0002.bmp
frame0003.bmp
frame0004.bmp

etc., it seems to work, so it's filename-related.

The next quirk is that it doesn't appear to support
4-bit BMP files. That's actually quite too bad, since
some scientific apps may only need that much color.

The last quirk is more of a feature request: would it
be possible to include a command-line interface? That
would be really helpful for doing this on a repeated
basis. Keep up the good work!!! -- Paul