A method invocation expression. Because invocation of methods on persistent
classes is not supported, we can simply resolve the invocation to a reflection
method object.
TODO: What is the best way to handle these (esp. Collection.contains which
does not behave like the Java method) ?
author: Thomas Dudziak
Creates a new method invocation object.
Parameters: base - The base expression (can be null) Parameters: methodName - The name of the method Parameters: args - The arguments