This script is useful in sending a (or several) file to people who request it.
It parses the "Subject:" line for a user-defined sub-string.
The files and subject to match are defined the first time the script is run. They can be removed only by re-compiling the script, so it's wise to make copies of the "virgin" script...

Author: Philippe Casgrain (Casgrain@ecol.ucl.ac.be, Casgrain@ere.umontreal.ca)