Allow setting of canAttachExisting and canPreviewFolder

Allow the setting of canPreviewFolder (to hide upload location) and canAttachExisting (to hide the "From files" button) to the UploadField, via GridFieldBulkUpload config.

bulkUpload/code/GridFieldBulkUpload.php

@@ -21,7 +21,9 @@ class GridFieldBulkUpload implements GridField_HTMLProvider, GridField_URLHandle
     'fileRelationName'  => null,
     'folderName'        => 'bulkUpload',
     'maxFileSize'       => null,
-    'sequentialUploads' => false
+    'sequentialUploads' => false,
+    'canAttachExisting' => true,
+    'canPreviewFolder'  => true
 	);
 
 
@@ -161,6 +163,9 @@ class GridFieldBulkUpload implements GridField_HTMLProvider, GridField_URLHandle
 			->setConfig('previewMaxHeight', 20)
 			->setConfig('changeDetection', false)
 
+			->setConfig('canPreviewFolder', $this->getConfig('canPreviewFolder'))
+			->setConfig('canAttachExisting', $this->getConfig('canAttachExisting'))
+
 			->setTemplate('GridFieldBulkUploadField')
 			->setDownloadTemplateName('colymba-bulkuploaddownloadtemplate')
 			
@@ -298,4 +303,4 @@ class GridFieldBulkUpload implements GridField_HTMLProvider, GridField_URLHandle
 		
 		return $handler->handleRequest($request, DataModel::inst());		
 	}
-}
+}