debbugs: add support for usertags search
Add new search type: usertag. To search for bugs, tagged "foo" for user "user@example.com" one would use following command:
$ surfraw debbugs -user=user@example.com foo
If "user" option is not specified on command line, following is tried, in order:
- $SURFRAW_debbugs_user environment variable.
- $DEBEMAIL environment variable, used by programs in "devscripts" package.
- Error message is printed.
Debbugs allows search for bugs, user-tagged by some particular user with /any/ usertag. Unfortunately, such search does not fit into current interface of "debbugs" elvi, so support for such search is omitted.
Signed-off-by: Dmitry Bogatov KAction@debian.org