related to #1693 changed smarty version to 4.1.0

include/smarty/docs/programmers/api-variables/variable-error-reporting.md

@@ -0,0 +1,17 @@
+\$error\_reporting {#variable.error.reporting}
+==================
+
+When this value is set to a non-null-value it\'s value is used as php\'s
+[`error_reporting`](&url.php-manual;error_reporting) level inside of
+[`display()`](#api.display) and [`fetch()`](#api.fetch).
+
+Smarty 3.1.2 introduced the
+[`muteExpectedErrors()`](#api.mute.expected.errors) function. Calling
+`Smarty::muteExpectedErrors();` after setting up custom error handling
+will ensure that warnings and notices (deliberately) produced by Smarty
+will not be passed to other custom error handlers. If your error logs
+are filling up with warnings regarding `filemtime()` or `unlink()`
+calls, please enable Smarty\'s error muting.
+
+See also [debugging](#chapter.debugging.console) and
+[troubleshooting](#troubleshooting).