Improved core::FakeFS handling of '..' directory.
Removed useless list of entities in core::FakeFS.
Changed the way of allocating FakeFS::_node.
Factorised path parsing code in core::FakeFS.
Added a method to get the absolute path of a node in core::FakeFS.
core::FakeFS can now save links to entities.
core::FakeFS can now load links to entities.
core::FakeFS::link can now link to namespaces.
core::FakeFS now load and save links to namespaces.
core::FakeFS now handles '.' and '..' in paths.
Merge branch 'abr_points_dir'