How to usage statistics

1. remove usage statistics plugin
On server:
/evalp sys.unloadServerPlugin("Usage Statistics")
-> true

2. Update statistics
On shell:
cd ~/alpha/bin/
LD_LIBRARY_PATH=. ./StatsExtracter
cd usage_stats
python archive_usagestats.py month year
mv raw raw.bk
mkdir raw
./gen_past-stats_index.sh > formatted/Past\ Stats/index.html

3. Reload the plugin
/evalp sys.loadServerPlugin("serverplugins/libusagestats.so")
-> true
