isDebug now also checks melange version
To facilitate this getMelangeVersion was introduced and in order to
not show the 'Flush Cache' button a isLocal method was also added.
Patch by: Sverre Rabbelier
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
<html lang="en">
<head>
<title>500 Server Error</title>
</head>
<body><h1>500 Server Error</h1></body>
</html>