Updates libjitsi (to daaae4d1) and adapts to it.
Drops incoming RTP packets early.
Adds jitsi-hammer.jar to .gitignore.
Don't set separate cache and log directories, so that the home dir is used for everything.
Make the config file read-only.
Uses .jitsi-hammer as the home dir.
Updates libjitsi and sets the configuration property which prevents
unencrypted RTP packets to be sent.