Got fred-official building with Maven

Upgraded LICENSE from GPL v2 to GPL v3
Added dependencies to pom.xml
- Bouncy Castle comes from Maven central
- freenet-ext was included as a project-local repository
Moved source directories to canonical Maven locations:
- src/freenet -> src/main/java/freenet
- src/net -> src/main/java/net
- test/freenet -> src/test/java/freenet
- test/net -> src/test/java/net
Rehabilitated some unit tests
- Moved some test data out to src/test/resources
- Minimal fixes to some unit tests so the project can build