1. Handle filenames with spaces
2. Check if pdflatex and attachfile packages are installed before trying
to use them.
3. Use a more intuitive interface "pdfattach -o file.pdf file1.djvu
[file2.djvu]..." instead of forcing the user to specify "-i" option for
every input file.
This utility creates a PDF file containing specified files embedded into
it as attachments. The attachments can be extracted from the PDF file by
using extr utility.
I placed this in a separate "utils" directory to signify that this is
NOT intended to run on a Kindle (it requires pdfLaTeX to generate the
PDF file) but only on the desktop Linux workstation.