Log Message:
Update to bogofilter-0.16.4, bl3ify, tidy up DESCR.  Okayed by jmmv and wiz.

Changes since 0.15.7:
* Perl 5.6 fixes in bogoupgrade
* Install bogotune and bogotune man page
* The -q and -F flags (both unused) were removed
* Alpha/SH(3?) portability fixes
* Gobs and gobs of bugfixes
* The Graham and Robinson algorithms were removed
* Support for old style (separate good/bad) wordlists was removed
* Support for ignore lists was removed