Motivated by github PR #14. no-tn-check Change-Id: I866431c55fe0937f348d08cd8a188eb40fc8f061
R110-010 Change-Id: I1034afb9624eb25bd48f42dae8ee7637f255af21
Part of major reorganization of gnatcoll for better modularity and maintainability. Change-Id: Iad961b53634520081eb90c37aff2bfdbf58b2e06 TN: P909-033 no-precommit-check