Activate `soap-invoke-async' in debbugs

Activate `soap-invoke-async' in debbugs

* packages/debbugs/Debbugs.wsdl:
* packages/debbugs/debbugs-browse.el:
* packages/debbugs/debbugs-gnu.el:
* packages/debbugs/debbugs-org.el:
* packages/debbugs/debbugs-ug.texi:
* packages/debbugs/debbugs.texi: Update copyright years.

* packages/debbugs/debbugs.el: Update copyright years.
(debbugs-soap-invoke-async): Activate `soap-invoke-async'.
(debbugs-get-status): Use `accept-process-output' rather than `sit-for'.