Switched to holding links in a separate list from router_signals.
Release router_signals on mdev_free()
Free connections before links.
Retrieve slot number from incoming signal updates.
Switch to using non-db versions of link and connection data structures, which represent entities from the perspective of the device; further renaming of link properties to support undirected links.
Update Java bindings for link property changes.
Experimenting with changes to monitor API.
Fixed  bug in mdev_remove_input/output()
Adding rough beginnings of combiner implementation.