This reverts commit db7c47f97d.
Too many joined channels at once started to cause disconnect because of
"Max SendQ Exceeded", which is not much better than previous Flood.
Now MaxJoins is 0 by default, which preserves the current behavior of
joining all channels at once. If someone experiences those disconnects
due to SendQ, they can tune MaxJoins.
Fix#329
Conflicts:
include/znc/User.h
modules/controlpanel.cpp
modules/webadmin.cpp
src/User.cpp