IMPORTANT: When drawing edges toward a single instance sub process node
that refers to an imported process/project, we force the loading oif the
referred process/project
Upon deserialization, we no longer clear portmap registery (that end up
clearing valid edges)
FlexoModelObjectReference no longer try to open a project 3 times (or
even more).
RESOLVED - issue OPENFLEXO-839: impossible to select a folder to store
the generated doc  https://bugs.openflexo.com/browse/OPENFLEXO-839
LOW: Slight improvement in may represent method
LOW: Removed unused method
Merge branch '1.5.2' of ssh://git@github.com/agilebirds/openflexo.git into 1.5.2