remove not needed symbol exception

alib2data/src/alphabet/SymbolException.cpp

-/*
- * SymbolException.cpp
- *
- *  Created on: Apr 13, 2016
- *      Author: Jan Trvnicek
- */
-
-#include "SymbolException.h"
-
-namespace alphabet {
-
-SymbolException::SymbolException(const std::string& cause) :
-		CommonException(cause) {
-}
-
-} /* namespace alphabet */

alib2data/src/alphabet/SymbolException.h

-/*
- * SymbolException.h
- *
- *  Created on: Apr 13, 2016
- *      Author: Jan Trvnicek
- */
-
-#ifndef SYMBOL_EXCEPTION_H_
-#define SYMBOL_EXCEPTION_H_
-
-#include <exception/CommonException.h>
-
-namespace alphabet {
-
-/**
- * Exception thrown by an tree, tree parser or tree printer.
- */
-class SymbolException: public exception::CommonException {
-public:
-	explicit SymbolException(const std::string& cause);
-};
-
-} /* namespace alphabet */
-
-#endif /* SYMBOL_EXCEPTION_H_ */