Bugfix: Duplicate names were not excluded since commit 3413e81

GeneralObj have 2 names: the one registered as field, and the one
registered as an attribute.

It was creating many lack of coherence. There is now only the attribute
field. The fix is not pretty since we need to send the global attributes
to the objects, but it will be ok for a while.
Merge remote-tracking branch 'fizzim/master'. Integrating bugfix.

Conflicts:
	src/display/DrawArea.java
	src/entities/StateObj.java
	src/entities/TextObj.java