XML output does not contain JHove schema declaration

[tofi86]

Current XML output is:

<jhove xmlns="http://hul.harvard.edu/ois/xml/ns/jhove"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	date="2012-10-31"
	name="epubcheck"
	release="4.0.0-alpha11-SNAPSHOT" >
...
</jhove>

and it does not contain the XSD schema declaration of the JHove schema.

It should better be:

<jhove xmlns="http://hul.harvard.edu/ois/xml/ns/jhove"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       date="2017-01-02"
       name="epubcheck"
       release="4.0.3-SNAPSHOT"
       xsi:schemaLocation="http://hul.harvard.edu/ois/xml/ns/jhove http://hul.harvard.edu/ois/xml/xsd/jhove/jhove.xsd">
...
</jhove>

With this addition it is possible to validate the XML output in any XML Editor.