Start storing users
* [x] New XML file, configurable from config file.
* [x] `=account register` command
* [x] Some way to delete your own account (`=account delete`) - with confirmation (`=account deleteconfirm <mask>`)
* [ ] Some way for admins to forcibly delete accounts (`=account forcedelete <accountname>`)
* [x] Some way to change your email address (`=account email <mail>`)
* [x] Don't force an email address to be stored
* [x] Email confirmation before activation (`=account verify <code>`)
* [ ] Privacy policy for holding email address
* [x] Timeout for email verification
== XML ==
* root
** users
*** user mask= mail= globalflags= mailconfirmed=
*** user mask= mail= globalflags= confirmationhash=
*** user mask= mail= globalflags=
*** user mask= globalflags=
*** user mask= globalflags=
*** ...