Bug 8210: add links to authorities to headings in OPAC

At the moment, there is no way to get to an authority record from a bib
record that uses it other than doing a new search on the authority file.
This patch adds a link (a cute little magnifying glass) to linked
authority records on the OPAC detail view for MARC21 and NORMARC
with XSLT enabled. A follow-up patch will add the link to regular mode.
Because UNIMARC handles authorities differently, the link is not added
to the XSLT.

Test plan:
1) Set OPACXSLTDetailsDisplay to 'default'
2) View a record that has some headings that are linked to authority
   records in the OPAC (easiest way to find a record like that is to
   edit a record and add some headings using the thesaurus plugin)
3) Observe the cute little magnifying glass links to the authority.

Revised version of the patch adds a space between the heading and the
magnifying glass.

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Patch works nicely.

If a library does not like to see the
magnifying glass/link to the authority, it's easy to disable it
by adding the line .authlink {display:none;} to OpacUserCSS.

koha-tmpl/opac-tmpl/prog/en/css/opac.css

@@ -2706,6 +2706,10 @@ ul.ui-tabs-nav li {
     display: inline-block;
 }
 
+.authlink {
+    padding-left: 0.25em;
+}
+
 /* jQuery UI Datepicker */
 .ui-datepicker table {width: 100%; font-size: .9em; border : 0; border-collapse: collapse; margin:0 0 .4em; }
 .ui-datepicker th { background : transparent none; padding: .7em .3em; text-align: center; font-weight: bold; border: 0;  }

koha-tmpl/opac-tmpl/prog/en/xslt/MARC21slim2OPACDetail.xsl

@@ -505,6 +505,12 @@
                 </xsl:with-param>
             </xsl:call-template>
             </a>
+            <xsl:if test="marc:subfield[@code=9]">
+                <a class='authlink'>
+                    <xsl:attribute name="href">/cgi-bin/koha/opac-authoritiesdetail.pl?authid=<xsl:value-of select="marc:subfield[@code=9]"/></xsl:attribute>
+                    <img style="vertical-align:middle" height="15" width="15" src="/opac-tmpl/prog/images/filefind.png"/>
+                </a>
+            </xsl:if>
             <xsl:choose>
             <xsl:when test="position()=last()"></xsl:when>
             <xsl:otherwise> | </xsl:otherwise>
@@ -912,6 +918,12 @@
                     <xsl:text>]</xsl:text>
                 </xsl:if>
             </a>
+            <xsl:if test="marc:subfield[@code=9]">
+                <a class='authlink'>
+                    <xsl:attribute name="href">/cgi-bin/koha/opac-authoritiesdetail.pl?authid=<xsl:value-of select="marc:subfield[@code=9]"/></xsl:attribute>
+                    <img style="vertical-align:middle" height="15" width="15" src="/opac-tmpl/prog/images/filefind.png"/>
+                </a>
+            </xsl:if>
         </xsl:for-each>
         <xsl:text>.</xsl:text>
     </xsl:template>

koha-tmpl/opac-tmpl/prog/en/xslt/NORMARCslim2OPACDetail.xsl

@@ -119,6 +119,12 @@
             </xsl:otherwise>
         </xsl:choose>
         <xsl:call-template name="nameABCDQ"/></a>
+        <xsl:if test="marc:subfield[@code=9]">
+            <a class='authlink'>
+                <xsl:attribute name="href">/cgi-bin/koha/opac-authoritiesdetail.pl?authid=<xsl:value-of select="marc:subfield[@code=9]"/></xsl:attribute>
+                <img style="vertical-align:middle" height="15" width="15" src="/opac-tmpl/prog/images/filefind.png"/>
+            </a>
+        </xsl:if>
         <xsl:choose>
         <xsl:when test="position()=last()"><xsl:text>.</xsl:text></xsl:when><xsl:otherwise><xsl:text>; </xsl:text></xsl:otherwise></xsl:choose>
         </xsl:for-each>
@@ -134,6 +140,12 @@
             </xsl:otherwise>
         </xsl:choose>
         <xsl:call-template name="nameABCDN"/></a>
+        <xsl:if test="marc:subfield[@code=9]">
+            <a class='authlink'>
+                <xsl:attribute name="href">/cgi-bin/koha/opac-authoritiesdetail.pl?authid=<xsl:value-of select="marc:subfield[@code=9]"/></xsl:attribute>
+                <img style="vertical-align:middle" height="15" width="15" src="/opac-tmpl/prog/images/filefind.png"/>
+            </a>
+        </xsl:if>
         <xsl:choose><xsl:when test="position()=last()"><xsl:text>.</xsl:text></xsl:when><xsl:otherwise><xsl:text>; </xsl:text></xsl:otherwise></xsl:choose>
         </xsl:for-each>
 
@@ -148,6 +160,12 @@
             </xsl:otherwise>
         </xsl:choose>
         <xsl:call-template name="nameACDEQ"/></a>
+        <xsl:if test="marc:subfield[@code=9]">
+            <a class='authlink'>
+                <xsl:attribute name="href">/cgi-bin/koha/opac-authoritiesdetail.pl?authid=<xsl:value-of select="marc:subfield[@code=9]"/></xsl:attribute>
+                <img style="vertical-align:middle" height="15" width="15" src="/opac-tmpl/prog/images/filefind.png"/>
+            </a>
+        </xsl:if>
         <xsl:choose><xsl:when test="position()=last()"><xsl:text>.</xsl:text></xsl:when><xsl:otherwise><xsl:text>; </xsl:text></xsl:otherwise></xsl:choose>
 
         </xsl:for-each>
@@ -345,6 +363,12 @@
                 </xsl:with-param>
             </xsl:call-template>
             </a>
+            <xsl:if test="marc:subfield[@code=9]">
+                <a class='authlink'>
+                    <xsl:attribute name="href">/cgi-bin/koha/opac-authoritiesdetail.pl?authid=<xsl:value-of select="marc:subfield[@code=9]"/></xsl:attribute>
+                    <img style="vertical-align:middle" height="15" width="15" src="/opac-tmpl/prog/images/filefind.png"/>
+                </a>
+            </xsl:if>
             <xsl:choose>
             <xsl:when test="position()=last()"></xsl:when>
             <xsl:otherwise> | </xsl:otherwise>