Data export API

Files:

export_w28_1999.html
dump_w33_2000.html
new_users_w46_2002.html
clients_w7_2003.html
registrations_w47_2004.html
passwords_w12_2005.html
users_w5_2006.html
food_w43_2007.html
extensions_w18_2008.html
secrets_w5_2010.html