Add basic Buefy support for App Settings page

also various buttons have been tweaked on some other "master view" pages

tailbone/templates/grids/buefy.mako

@@ -67,7 +67,7 @@
 
       <div class="grid-tools-wrapper">
         % if tools:
-            <div class="grid-tools">
+            <div class="grid-tools field is-grouped">
               ## TODO: stop using |n filter
               ${tools|n}
             </div>
@@ -299,6 +299,14 @@
               // apply current filters as normal, but add special directive
               const params = ['save-current-filters-as-defaults=true']
               this.applyFilters(params)
+          },
+
+          deleteResults(event) {
+
+              // submit form if user confirms
+              if (confirm("You are about to delete " + this.total + " ${grid.model_title_plural}.\n\nAre you sure?")) {
+                  event.target.form.submit()
+              }
           }
       }