Compiler warnings

[remkop]

CommandLine.java:2199: warning: [static] static method should be qualified by type name, ShortestFirst, instead of by an expression
String[] names = new ShortestFirst().sort(option.names());

all exceptions:
CommandLine.java:3143: warning: [serial] serializable class ParameterException has no definition of serialVersionUID

CommandLine.java:1449 & 1111: warning: [unchecked] unchecked cast
Stack copy = (Stack) args.clone();

CommandLine.java:1237: warning: [rawtypes] found raw type: ITypeConverter
ITypeConverter converter = getTypeConverter(type);

[remkop]

CommandLine.java:1290: warning: [rawtypes] found raw type: ITypeConverter
CommandLine.java:1314: warning: [rawtypes] found raw type: ITypeConverter