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catfs a FUSE based filesystem for mounting multiple file segments

motivation:
	catfs may be used for mounting harddisk images split over many files without the need
	to concatenate the images. I wrote it because I wanted to mount several ftp services
	in a raid setup.  But most of the free ftp services I could find would only allow
	files a few megabytes big; while offering gigabytes of storage space.
	Setting up hundreds of loopback devices wasn't a very clean solution.

mounting files:
	catfs mount-dir filename-in-mounted-fs:path_to_segment1:path_to_segment2
	catfs /mnt harddrive:/tmp/hdd01:/tmp/hdd02:/tmp/hdd03

	multiple files may be specified
		catfs /mnt harddrive1:/tmp/hdd01:/tmp/hdd02:/tmp/hdd03 harddrive2:/tmp/hdd21:/tmp/hdd22

caveats:
	catfs always tries to mount the specified files in read/write mode.
	However if even one of the source segments is read-only, then the
	whole mounted file becomes read-only.

	There is also an open file descriptor limit on most systems.