Merge: Name entities

As suggested in #986 and #1030, promote `full_name` and `c_name` in MEntity in model so client of the model will have some homogenous ways to names entities.

Pull-Request: #1032
Reviewed-by: Alexis Laferrière <alexis.laf@xymus.net>
Reviewed-by: Alexandre Terrasa <alexandre@moz-code.org>

diff --cc src/compiler/abstract_compiler.nit
Simple merge