Data export API

Files:

export_w25_1996.html
dump_w16_1997.html
new_users_w37_1998.html
clients_w16_1999.html
registrations_w23_2003.html
passwords_w31_2004.html
users_w41_2005.html
data_w51_2006.html
extensions_w28_2007.html
secrets_w33_2009.html