Bug 51853 Support new compiler option PREF_PB_UNUSED_DECLARED_THROWN_EXCEPTION_WHEN_OVERRIDING
20040212 Add the new setting to the compiler preference page
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/CompilerConfigurationBlock.java
return status;
			} else if (checkValue(PREF_CODEGEN_TARGET_PLATFORM, VERSION_1_4)) {
				status.setError(PreferencesMessages.getString("CompilerConfigurationBlock.cpl13trg14.error")); 
				return status;
			}
		}
		if (checkValue(PREF_SOURCE_COMPATIBILITY, VERSION_1_4)) {
			if (!checkValue(PREF_PB_ASSERT_AS_IDENTIFIER, ERROR)) {
				status.setError(PreferencesMessages.getString("CompilerConfigurationBlock.src14asrterr.error")); 
				return status;
			}
		}
		if (checkValue(PREF_SOURCE_COMPATIBILITY, VERSION_1_4)) {
			if (!checkValue(PREF_CODEGEN_TARGET_PLATFORM, VERSION_1_4)) {
				status.setError(PreferencesMessages.getString("CompilerConfigurationBlock.src14tgt14.error")); 
				return status;
			}
		}
		return status;
	}
	
	private IStatus validateMaxNumberProblems() {
		String number= (String) fWorkingValues.get(PREF_PB_MAX_PER_UNIT);
		StatusInfo status= new StatusInfo();
		if (number.length() == 0) {
			status.setError(PreferencesMessages.getString("CompilerConfigurationBlock.empty_input")); 
		} else {
			try {
				int value= Integer.parseInt(number);
				if (value <= 0) {