Remove dead code
Test case and goleveldb fix (fixes #740, fixes #796)
Archive a copy of config.xml when the format changes
Threshold for existing languages to be included (75%)
Translation update
Better version change detection (fixes #808, fixes #810)
Restarting monitor process is still considered a restart (fixes #809)
Slightly improve panic log format (...)

 - Don't repeat the first log lines
 - Print panic timestamp in context.
Print some debug info when panicing in leveldb