!!!VolksForth logic words

* [true]
* [false]
* [0=|Zero-equals]
* [0<>|Zero-noequal]
* [0<|zero-less]
* [0>|zero-greater]
* [=|equals]
* [<|less-than]
* [>|greater-than]
* [u<|u-less-than]
* [u>|u-greater-than]
* [and]
* [or]
* [xor]
* [uwithin]
* [case?|case-question]