parameter descriptors does not work yet.

…le output models.

… a True-like value, so ensure that we actually get a float when a float result is expected.

…e output models

…l as classes

…creating new model classes with custom names.

…s. In retrospect it should have been blatantly obvious that was a bad idea, and unnecessary anyways. Turns out Python creates a new method object every time you access a method on an object anyways (this is still reasonably efficient, as it uses a cache of already malloc'd PyMethodObjects and just updates the im_func and im_self pointers on those objects).

…erly support parameterless models here.

…om for improvement here but this is a start.

…y expression. This requires one input which is a mapping of operators to a numerical precedence so that the correct order of operations can be determined. This ended up looking a lot like ExpressionTree.evaluate, which might be able to be used to implement this with a little refactoring.

…afs. This method still needs more work though :/

…improved, later.

…il the enhancements to the tree display are complete.

… a new instance is returned, rather than the class itself. If the class is for some reason needed it can still be gotten at, but in most cases it seems to be clearer if we just return an instance.

…t__.py