+ (partial?) scoping support

OCL Java code generator optimizes away the first condition "not self.container().oclIsUndefined()" because it thinks that "self.container()" can never be null although the return value is marked optional (assuming a bug in Pivot OCL)

enabled OCL validation + Workaround for Complete OCL validator initializer configurator issue (see comment in code)

- rolled back project configuration for model as OCL delegate setting does not seem to make a difference

Added TO specific 'Element' class to implement TO specific 'Element' operations + added missing operations.

This reverts commit 09dec1d4.