nickserv/drop: request confirmation when dropping an account

Drop it ChanServ style, because apparently people keep expecting it to
do the same as RELEASE and GHOST...
Merge pull request #196 from grawity/nickserv-confirm-drop

nickserv/drop: request confirmation when dropping an account
Allow protected or owners to register channels too

In Unreal and InspIRCd, the protected and owner channel status also
confer operator status.  Allow these statuses to register channels as
well.  As only protocols that have these statuses set the status flags
in the chanuser objects, this is safe for any protocol module.

Fixes #188
linker: Avoid leaving the error string uninitialized.

Note that libmowgli-2 already calls dlerror(), so it cannot be called again.
Put in a generic error message.
nickserv/drop: Fix format string in confirmation message.
chanserv/register: Fix silly bug that allowed nonchanops to register channels.
libathemecore, *serv: unify all three copies of create_challenge()

Should've done this earlier, I guess.
Merge pull request #200 from grawity/unify-create-challenge

libathemecore, *serv: unify all three copies of create_challenge()
Add createburst to .gitignore
Update contrib modules snapshot
Update contrib modules snapshot again
Merge branch 'master' of github.com:atheme/atheme
Update contrib modules snapshot one last time
dist/atheme.conf.example: fixed spelling error in GroupServ config
Merge pull request #202 from shockkolate/master

dist/atheme.conf.example: fixed spelling error in GroupServ config
operserv/mode: Announce mode change success before tokenization (closes #197)

It's true that the command has not actually been executed at the time this
message is sent. However, it is now sent at the same time as the wallops
and logcommand, providing consistency between the meaning of all three.
nickserv/drop: fix drop command args count
Merge pull request #203 from kabaka/master

nickserv/drop: fix drop command args count
configure: Check for openssl/ec.h

Closes #185
configure: only disable what needs openssl/ec.h