BiffLes 0.7

BiffLes does what does the "procmail" MDA does, but in one run. BiffLes project is meant to be used off-line by dial-up clients where mail is fetched via a nightly cron-job, amassed localy, and then sorted.
Goal:
- received mail (in a couple of mailboxes) is tested against a set of rules;
- if mail match a rule, then its tided mailbox is added as an outbox;
- if set of outboxes isnt empty, mail is copied into those mailboxes;
- if none rule matches (outbox set is empty), then its left in mailbox;
Main features:
- rules are pairs of header name and regexp;
- a number of rules tied to the particular mailbox is limited only by Perl resources;
- mailbox type are mbox, maildir, mh, and any other supported by Mail::Box object class;
- a number of mailboxes is limited only by Mail::Box resources;
- only two mailboxes are opened concurently (its possible to keep only one mailbox opened, but that would decrease performance unbearable (Mail::Box issue;))
- its possible to configure biffles the way when a mail can match many outboxes (thats dangerous, but gives well known in the FTN world carbon functionality.)