Data export API

Files:

export_w36_1996.html
dump_w40_1997.html
new_users_w36_1998.html
clients_w1_1999.html
passwords_w11_2000.html
users_w27_2001.html
food_w2_2002.html
data_w25_2004.html
extensions_w26_2005.html
secrets_w19_2009.html