Add a Disablechan to match the Enablechan command
Whitelisted X-Forwarded-For header support
Fixed redundant removal of trailing spaces
awaystore: ping when requesting to come back

When using the `back` command, also call `Ping()`. Otherwise, we will
be marked away in less than a minute.
Fix new OnAdd/DeleteNetwork hooks for perl/python
Merge pull request #426 from vincentbernat/fix/awaystore

awaystore: ping when requesting to come back
Merge commit 'refs/pull/349/head' of github.com:znc/znc
X-Forwarded-For: verify the whole chain, from the end
Don't generate .pyc files ourself

It's good for cross-compilation, because in that case binaries produced
by CXX are not runnable.
Merge branch 'master' of github.com:znc/znc
Merge pull request #341 from cork/master

Add irc command to allow disabling channel