Tracker Sync

When running an issue tracker -- e.g. for tracking bugs and feature
requests of a software project -- sooner or later the requirement arises
that you want to synchronize certain issues with an external issue tracker.

External issue trackers might be run by an external open source project
where you're monitoring certain issues because bugs you're tracking
locally depend on fixes of the remote project. Or you're a company
tracking issues of their customers -- the customer may run their own
issue tracker and certain issues in the customer's tracker are for you.

This project solves this requirement. Currently the local issue tracker
(the one *you* are running) is limited to roundup_, an open source issue
tracker. For the remote tracker we're currently supporting KPMweb, the
issue tracker run by VW/Audi with access for their suppliers -- if
you're one of them you know how to access it. Other remote trackers are
currently being implemented, notably support for jira_.