callmonitor-1.20.3 (beta); refs #1955.
 * Supports new multi-user login scheme (Fritz!OS 5.50 and above): If you have multiple users, please choose one of them (with admin permission; possibly a dedicated one) for Callmonitor in the configuration. In single-user mode, everything should just work automatically.
 * Uses `ctlmgr_ctl` for `config` action (where supported)
 * Still needs a lot of testing!


git-svn-id: file:///var/svn/freetz/trunk@9876 149334a1-2f27-0410-a3b9-fc62619ac1e6