presencemanager: Lower log level of a message

mod_saslauth: Remove 2 instances of raising errors and replacing with more graceful handling

mod_saslauth: Various logging fixes

mod_saslauth: Use module logger instead of creating a new one

mod_dialback: Use module logger instead of creating a new one

modulemanager: Update logger when a module becomes global

Merge with 0.4

loggingmanager: Add ability to set 'log' config option to a filename, which causes all levels >= info to be logged to that file

Merge with 0.4

mod_*: Fix many unnecessary global accesses in modules (already committed to main repo)

core.componentmanager: Really fix marking components as disconnected when unregistered

configure: Honour --sysconfdir parameter; thanks to Michael Scherer

mod_posix: Fix calls to log() (replace with module:log) and make some global accesses explicit

mod_posix: Fix for removing the pidfile on exit

mod_muc: The default component name is now 'Chatrooms'

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