oai-pmh update how non-optimal endpoints are shown

Motivation:

Currently, if an endpoint has harvesting suspended then the cell is
shown as green, with no indication of any problem.  Similarly, when
there was a problem, the message is Status: Error, with limited
explanation.

Modification:

Remove "Status: Error" as this (in essence) provides no information that
isn't already captured by the cell colour.

Update cell colour to show when harvesting was disabled, now shown as an
orange cell.  This is meant as a kind of half-way between green (=>
good) and red (=> bad).

For both cases (error and harvesting disabled) a simple text is
provided.

Result:

The output is now better reflects the status of the endpoints.

open-data-resources.html

@@ -48,7 +48,10 @@ title: Open data resources
         {% endif %}
       </td>
       {% if facility.odr.oai-pmh-endpoint.status == "Active"
-          %}<td class="adopted">{%
+          %}{% if facility.odr.oai-pmh-endpoint.skip-harvesting
+            %}<td class="planned">{%
+              else
+            %}<td class="adopted">{%endif%}{%
         elsif facility.odr.oai-pmh-endpoint.status == "Error"
           %}<td class="no">{%
         else
@@ -58,7 +61,11 @@ title: Open data resources
         <div class="tooltip-cont">
           <div class="trigger-tooltip">Endpoint:&nbsp;<a href="{{facility.odr.oai-pmh-endpoint.link}}">link</a>
               [<a href="{{facility.odr.oai-pmh-endpoint.link}}?verb=Identify">Identify</a>]<br/>{%
-            if facility.odr.oai-pmh-endpoint.items
+            if facility.odr.oai-pmh-endpoint.skip-harvesting
+                  %}Harvesting suspended.{%endif%}{%
+              if facility.odr.oai-pmh-endpoint.status == "Error"
+                  %}Querying failed.{%endif%}{%
+              if facility.odr.oai-pmh-endpoint.items
               %}Items:&nbsp;<b>{{facility.odr.oai-pmh-endpoint.items.count | thousands_separated}}</b>{%
               assign total_oai_pmh_dataset_count = total_oai_pmh_dataset_count | plus: facility.odr.oai-pmh-endpoint.items.count %}{%
               if facility.odr.oai-pmh-endpoint.items.sets%}
@@ -77,7 +84,6 @@ title: Open data resources
                   </table>
                 </div>{%
               endif %}{%
-            else %}Status: {{ facility.odr.oai-pmh-endpoint.status }}{%
             endif %}
           </div>
           <span class="tooltip">last check: {{ facility.odr.oai-pmh-endpoint.last-check | date: "%Y-%m-%d" }}</span>