* packages/debbugs/debbugs-gnu.el (debbugs-gnu-get-bugs): Do not
specify :max.
(debbugs-gnu-rescan): Handle `current-prefix-arg'.
(debbugs-gnu-display-status): Insert comments in output.
* packages/debbugs/debbugs-ug.texi (Tabulated Lists): Mention the
prefix argument of debbugs-gnu-rescan.
* packages/debbugs/debbugs.el (debbugs-cache-expiry): Make it a
defcustom.
(debbugs-get-status): Delete dups before sending the soap
request. `debbugs-cache-expiry' could also be `t'.
(debbugs-get-status): Remove double code. Add bug to cache only
if `debbugs-cache-expiry' indicates this.
(debbugs-search-est): Retrieve all hits when there is no :skip or :max.