For example, it can now be used in Conditional, which is done as well.

Introducing base abstract class FunctionalOperator and template Operator<T> for a functional operator returning given type of Value. Assortment of copy methods and apply methods.

Intended as a base class for library-user-level operators and rules. Allows manipulation of Variables via get, set. Intoduces cloning support.

Doesn't hurt and can help.

Several operators has been implemented (and fixed), but still is many "non deterministics" parser warnings.

Conflicts:
	libwccl/parser/grammar.g