the new /statistics/detail api calls takes the type (contact, sender,
receiver) and address for which to display the statistics as explicit
parameter instead of path-component.
This makes it possible to accept '/' as part of an e-mail address
which is allowed (in the local-part by RFC5322 [0], and accepted by
postfix.
[0] https://tools.ietf.org/html/rfc5322
Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
