During the transition between v0.1.2 of ifile and v0.2.0, I have changed the
format which is used to store the information used for e-mail classification.

If you are upgrading from any v0.1.x version, each user which will be using
this new version of ifile will need to run the script './convert.perl'.  The
script will detect the user's home directory, back up the old data file and
create a newly formatted data file with the information from the old data
file.