- solr.xslt autor and author_sort are now sorted by @SortOrder

- composer updates
- new artisan command 'update:dataset {dataset : The ID of the dataset}' for updating solr index for specific datasets
- DatasetExtension.php: alaso svae 'sort_order' for authors and contributors
- twice solr.xslt: sort authors also in solr index

public/solr.xslt

@@ -136,6 +136,7 @@
 
                 <!-- author -->
                 <xsl:for-each select="/Opus/Rdr_Dataset/PersonAuthor">
+                    <xsl:sort select="@SortOrder"/>
                     <xsl:element name="field">
                         <xsl:attribute name="name">author</xsl:attribute>
                         <xsl:value-of select="@LastName" />
@@ -148,6 +149,7 @@
                 <xsl:element name="field">
                     <xsl:attribute name="name">author_sort</xsl:attribute>
                     <xsl:for-each select="/Opus/Rdr_Dataset/PersonAuthor">
+                        <xsl:sort select="@SortOrder"/>
                         <xsl:value-of select="@LastName" />
                         <xsl:text></xsl:text>
                         <xsl:value-of select="@FirstName" />