added check to avoid duplicated use of one username
changed first client to use xml for configuration
updated description
updated all alert clients to use xml for configuration
changed layout of registered file
updated manager clients to use xml for configuration
fixed flawed processing of delayed option changes (option change was done but manager clients were not updated)
updated all sensor clients to use xml for configuration
added version check of configuration file
updated server to use xml for configuration
removed postgresql support
removed some unnecessary whitespaces
updated protocol to 0.221
updated register process => registered file not needed anymore
fixed missing code line
fixed code line
removed necessity to use a registered file
removed the necessity of the registered file
updated version to 0.221
added database version check