* pop3.el (pop3-munge-message-separator): Use `parse-time-string'.

* pop3.el (pop3-munge-message-separator): Use `parse-time-string'.
* parse-time.el (parse-time-rules): Accept dates far into the past and the
future, and parse single-digit numbers as years.
(parse-time-string): One too many nils.
(parse-time-rules): Parse "Wed, 29 Apr 98 0:26:01 EDT" times.
(parse-time-rules): Accept times that look like "h:mm".
(parse-time-string): Downcase before handling.
(parse-time-rules): Times without seconds have 0 seconds.
(parse-time-syntax): Use vectors.