Update docs

docs/30_Configuration/10_Database.md

-
-# Basic settings #
-
-There are 2 defaults:
-
-```
-dir-localdumps = /var/iml-backup
-keep-days = 7
-```
-
-## dir-localdumps ##
-
-{string}
-
-The target directory for local dumps. It is used by 
-
-* the database dump scripts
-* the transfer script to store the client backups
-* the restore script
-
-Below that one a directory for the service will be generated; inside that one the database dumbs with scheme name and timestamp, i.e.
-
-    /var/iml-backup/mysql/mydatabase__20190827-2300.sql.gz
-
-## keep-days ##
-
-{integer}
-
-The number of days how long to keep dumps locally.
-
-Remark:
-To make a database restore its dump must be located at this directory.
-
-To restore an older database you need to restore the dump from the filke backup first.
-
-If you have local Mysql daemon or Pgsql you can test it by starting
-
-```
-# dump all databases
-sudo ./localdump.sh
-```
-
-```
-# show written files
-find /var/iml-backup
-```