Q module: Store default NVs on module load.
Q module: Don't cloak host on first module load while connected to IRC.
Q module: Add web config.

Move Cloak() from the Set command to SetUseCloakedHost() so that the
web config can use it also.
Merge pull request #526 from anders/q-nocloakdefault

Q module: Store default NVs and better default host cloak behavior, web page
webadmin/add channel: Correctly handle channel names

The CChan constructor makes sure that the channel name begins with a valid
channel prefix. Thus, this could change the name of the resulting channel.

When you edited an irc network which already had a channel "#foo", were
connected to IRC (so ZNC knows which prefixes are valid) and added a channel
"foo", this would lead to a problem:

Webadmin checks and sees that there is no channel "foo" yet. Webadmin creates a
new CChan instance for "foo". The CChan constructor notices that "f" is not a
valid channel prefix and instead calls itself "#foo". Then,
CIRCNetwork::AddChan() would see that this channel already exists, delete the
given channel and return false.

However, webadmin didn't check this result and would continue changing settings
on an already destroyed CChan instance.

Fix this by checking if the channel exists after CChan had its chance to mess
with the channel name. Also handle failures from CIRCNetwork::AddChan().

Fixes #528.

Signed-off-by: Uli Schlachter <psychon@znc.in>
controlpanel: Check if adding a new channel succeeded

Signed-off-by: Uli Schlachter <psychon@znc.in>