Added docket_multipage.xsl as a copy of docket.xsl

docket_multipage.xsl is the same stylesheed as docket.xsl or any process specific *.xsl. The only difference is that a docket for one process is a list with only one entry. The docket_multipage.xsl has to be in the xsltfolder as configured in goobi_config.properties. The internaly used XML holding the data used for the transformation to a pdf-file is the process logfile (Current processes -> Activity -> XML).