Reconsider relaxed parsing mode interface #343
Description
We might want to reconsider the interface of a global bool flag for relaxed parsing mode, see also #339 (comment).
The main issue I see is that the parameter would need to be passed through almost all levels of function calls. That will clutter function and ctor interfaces.
Note: Currently this is not used at all. When we actually start to use it we need to reevalute the feature and consider again how we cope with the inconsistencies that arise from it (invalid IRIs/Literals in storage vs. altering IRIs/Literals during loading to make them valid).