Disallow the local features (parameters, variables) with a name starting with the reserved prefixes.
Force Xtext to use Java 1.7 (issue #89).
Update the grammar for referencing the JVM objects correctly.
This commit provides the following answers to issues:
* issue #98: the generation of the delegating functions is done one the basis of the JVM objects (in place of the tokens).
* issue #17: the uses of the types are now correctly detected. The import statements are not correctly marked when they are not used. The "organize import" feature is working.
* issue #17: referencing the JVM objects in place of the tokens should permits to the auto-completion feature to detect the proposals.
* issue #92: enforce the code of the JVM inferrer for avoiding a NullPointerException.
* issue #46: write plenty of checking functions in the validator. This avoid the Java compiler to show errors in place of the SARL compiler.
* issue #93: the current grammar, the inferrer, and the validator are now compatible with Xtext 2.6.