- replaced osl_trace with sal_info
 - added new log areas to log-area.dox

Change-Id: I20f539bd9fa62bef2e9a2a82b59e0b15f4efdd48
Reviewed-on: https://gerrit.libreoffice.org/3179Reviewed-by: Thomas Arnhold <thomas@arnhold.org>
Tested-by: Thomas Arnhold <thomas@arnhold.org>