new superclass SystemError for errors reported by

system/libc-functions. You wouldn't normally catch this :)

[[Imported from SVN: r948]]

common/exceptions.hh

@@ -159,6 +159,14 @@ namespace Dune {
    */
   class RangeError : public Exception {};
 
+  /*! default exception class for OS errors
+
+     This class is thrown when a system-call is used and returns an
+     error.
+
+   */
+  class SystemError : public Exception {};
+
 } // end namespace
 
 #endif