Merge: Less fixme and todo

Looked at http://jenkins.gresil.org/jenkins/job/nit/tasks and did some work.

Pull-Request: #1077
Reviewed-by: Romain Chanoir <chanoir.romain@courrier.uqam.ca>
Reviewed-by: Alexis Laferrière <alexis.laf@xymus.net>

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

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

diff --cc src/loader.nit
Simple merge

diff --cc src/nitlight.nit
Simple merge