improved user interface
major overhaul - new _state table schema, new extraction file which (for now) only does CSV output
reintroduce all_tables.xls support
show all_tables.xls file in frontend
new button to regenerate all files
new, simpler save_state() function
sanitise file names. fixes #39
dataset update hook now runs the new code
reset the downloads table before a hook run
log at the start of each server-side script for clearer log.txt records
remove old extract.py
Merge pull request #40 from scraperwiki/v2

V2