update Piwik to version 2.16 (fixes #91)

www/analytics/core/Db/SchemaInterface.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * Piwik - Open source web analytics
+ * Piwik - free/libre analytics platform
  *
  * @link http://piwik.org
  * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
@@ -14,13 +14,6 @@ namespace Piwik\Db;
  */
 interface SchemaInterface
 {
-    /**
-     * Is this schema available?
-     *
-     * @return bool  True if schema is available; false otherwise
-     */
-    static public function isAvailable();
-
     /**
      * Get the SQL to create a specific Piwik table
      *
@@ -87,6 +80,15 @@ interface SchemaInterface
      */
     public function getTablesInstalled($forceReload = true);
 
+    /**
+     * Get list of installed columns in a table
+     *
+     * @param  string $tableName The name of a table.
+     *
+     * @return array  Installed columns indexed by the column name.
+     */
+    public function getTableColumns($tableName);
+
     /**
      * Checks whether any table exists
      *