Some Android devices require a lock to be held while using multicast, to
disable the packet filter that normally filters out multicast packets.

Fields in Android UI objects that are accessed from background threads
must be declared volatile. UI objects use data attached to DB events to
avoid DB lookups, which complicates the UI code but should improve
performance.

This should make it possible to develop the core in Eclipse without the ADT.

The project is now built as an Android project (via Eclipse or
ant). Tests have been moved to a separate project so they can exist
outside the Android build process. A basic Android app structure has
been created. A Bluetooth plugin for Android has been added, and the
Bluetooth plugin for J2SE has been modified to use the same techniques.