- added issue resolution job and libraries for defining how to resolve issues

- added issue inserts (fehlerupdate.php), included them in checksystem
- added getAufenthaltsdauer method to Bisio_model.php
- Add column parameterFuerBehebung to system.tbl_issue

application/core/IIssueResolvedChecker.php

@@ -0,0 +1,15 @@
+<?php
+
+/**
+ * Interface defining method to implement for issue resolution checker (from core and extensions)
+ */
+interface IIssueResolvedChecker
+{
+	/**
+	 * Checks if a issue of a certain type is resolved.
+	 * Classes for resolving a certain issue type implement this method.
+	 * @param array $params parameters needed for issue resolution
+	 * @return object with success(true) if issue resolved, success(false) otherwise
+	 */
+	function checkIfIssueIsResolved($params);
+}