Log Message:
Update to 0.92.8.

Changes:
* Portability fixes
* Documentation fixes
* '-M' allows processing 1 msg-count file with multiple messages.
  Otherwise allow multiple msg-count files with 1 message in each.
* Allow only one of '-d' and '-D' options for bogotune.
* Remove check for bogohome since it breaks "bogotune -D".
* Ignore 'X-Bogosity' lines in mime attachments.
* Bogotune now warns when using '-E' to suppress ESF checking
  and non 1.0 esf values are read from the config file.
* Limit bogotune's scanning to rx values between 0.4 and 0.6.
* Fix a potential crash on malformatted input (writing a NUL byte to
  the wrong place) in the RFC-2047 decoder. Reported by Clint Adams.
* bogofilter will now properly exit with code 3 when encountering write
  errors in pass-through mode. It would use the wrong code, 2, since
  the introduction of the "unsure" exit code.
* Properly flush existing data before changing I/O buffer size. Fixes
  t.bogodir failure seen, for instance, on Solaris, particularly with
  -D and redirected output.