Replace AJXP_Logger::debug call with $this->logDebug in plugins
(when we are in a $this context, and we 'extends' AJXP_Plugin)

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@fiducial.net>
Replace AJXP_Logger::logAction call with $this->logInfo in plugins

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@fiducial.net>
Use logError for errors

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@fiducial.net>