Set the default to only roll/calc once if not specified.

ref: atheme/atheme@d4634fd
libathemecore: update CTCP ABOUT.

ref: atheme/atheme@ab281b1
nickserv/enforce: do not check if a non-existent user is banned from a channel

ref: atheme/atheme@aa11092
ref: atheme/atheme@c533da7
ref: atheme/atheme@858d29c
nickserv/sendpass_user: require user/email combination

Require the caller to know the user/email combination unless they have
the user:sendpass priv. Don't leak information about if the mail was
sent or not, as to not allow people to find user's emails by guessing.

ref: ShutterQuick/atheme@d47b83d
nickserv/sendpass_user: Improve command success/failure output

ref: shalture/shalture@8884b60