Data export API

Files:

export_w40_1996.html
dump_w22_1998.html
new_users_w40_2000.html
clients_w33_2001.html
registrations_w28_2002.html
passwords_w42_2004.html
food_w17_2005.html
data_w39_2006.html
extensions_w15_2008.html
secrets_w4_2010.html