the Aoplib4JReadonly aspect

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The goal would be to implement the equivalent of the C# readonly keyword.

The definition of the C# readonly:
"Identifies a field as being read-only. Read-only fields are more flexible than 
constants because they can be initialized at declaration or within an instance 
constructor. Static read-only fields can be initialized at declaration or 
within a static constructor."

The implementation can contain a @Aoplib4jReadOnly annotation; only the fields 
can be annotated.

Another idea would be to annotate also the classes and then ALL the fields will 
became readonly; the fields that cannot be readonly should be annotated with 
@Aoplib4jReaonlyException (it's a good idea ?!) 

Original issue reported on code.google.com by adyc...@gmail.com on 22 Jan 2011 at 5:14