Encoding of XML configuration files should be respected

User Requirement

• If you have a UTF-8 encoded job configuration file with e.g. a ó in the title then the answer of a show_job command contains a ó instead.
• The XML configuration files are always decoded with ISO-8859-1, even if the XML prolog tells an other encoding. This is wrong. The given encoding should be respected.

Maintainer Notes

• This issue is resolved to the extent that characters encoded with UTF-8 are interpreted correclty by JobScheduler provided that they are in scope of the ISO-8859-1 encoding.
• The implementation of Unicode support including all characters available with UTF-8 is subject to JS-1374.