gphoto_download: Use gphoto to download images and thumbnails from camera
	and make a simple html interface.

Usage: gphoto_download <options> <output_dir>

Options:
	-T <title>		Set the title of the photo collection.

	-f <n>			Start downloading from image <n>
	-t <n>			Download only up to image <n>

	-n n1,n2,...		Only download images in comma separated
				list.  Can be range too -n 6,10-18

	-shift <n>		Shift the image numbering (output files)
				by amount <n>.

	-html or -H		Only make the html for output_dir (this
				will update the small images, unless 
				given by -html_only or -HO).

	-order_only or -O	Only use images in Set.order, do not
				append orphans to the end. (the default)

	-order_append or -OA	First use images in Set.order, then
				append orphans to the end.

	-small			Only make/update the small image section
	-no_small		Do not make the small image section.
	-small_size <geom>	Set the geom of small images. Def: halfsize

	-filter <cmd>		Filter ALL downloaded photos with the command
				which must be of the form:
					filter_command -args %OLD %NEW

	-large_width w		Set the cutoff pixel for a large photo
	-lw w			(default 1000)

	-in <dir>		Read images from input directory <dir>,
				e.g. a mounted flash memory card, perhaps
				this on haystack:

					-in /auto/smartmedia

	-m <merge_dir>		Merge all the images (with renumbering)
				in the output_dirs into a single directory,
				<merge_dir>

	-u			Launch the URL browser no matter what.

	-D <number> ...		In current directory (an outdir), remove all
				files associated with an number. Use two -D
				for no prompts about removal. Three for no
				sleep before removal.  <number> can be 
				individual numbers, or list n,m,k or range n-m

	-M <dir> <number> ...	Like -D but move them to directory <dir>
				instead of deleting.

	-C <dir> <number> ...	Like -M but copy them to directory <dir>

	-R <dir>		Renumber everything starting from 001 and
				place in <dir>

	NOTE: for -D -M -C -R you must be in the top of the photo
	source directory.

	-nt			Do not remake the small thumbnails.

	-dt			Download the small thumbnails only.
Notes:

	Programs needed: gphoto,  convert,  image_size   

	If the size of an image is more than 1000 pixels wide, it
	is saved to "large-NNN.jpg" and shrunk by 50%.  A link to 
	the very large image is provided for printing.