always use media-type-package if provided

[lueck]

When a media-type-package is provided to the document.xsl stylesheet, this media-type-package should always be responsible for the output after cutting out the requested parts of the resource.

Currently, the media-type-package is only used, if a mediaType is requested and if it is not among the media types document.xsl can return. However, user may want to customize the output even when a whole TEI document is requested.

Current responsible template in document.xsl:

   <xsl:template mode="document" match="document-node(element(TEI))" use-when="$media-type-package">
    <xsl:choose>
      <xsl:when test="not($mediaType) or ($mediaType and $mediaType = $default-media-types)">
        <xsl:call-template name="document"/>
      </xsl:when>
      <xsl:otherwise>
        <xsl:call-template name="transform"/>
      </xsl:otherwise>
    </xsl:choose>
   </xsl:template>

The branching should be dropped in favor of a simple call of transform. Users then have to care of adding a root element and a <dts:wrapper> if required.

The other dts parameters should also be passed to the media type processors.