Log Message:
Update of mail/nail to 10.5.

Changes since 10.4:
* A command line argument specifying a To-address can contain multiple
  recipients separated by commas (Werner Fink).
* 'showname' variable (based on code contributed by Stephen Isard).
* Display nonprintable characters in mail addresses as question marks.
* Fixed MIME encoding of user's From address with respect to quoted
  characters.
* 'autobcc' and 'autocc' variables.
* The effects of the 'bsdcompat' variable are now individually configurable.
  This introduces the 'bsdflags', 'bsdheadline', 'bsdset', 'bsdannounce',
  'askatend', 'bsdorder', and 'bsdmsgs' variables.
* The current message pointer could be garbled when 'newmail' was set and
  new messages appeared (Fix by Stephen Isard).