Implement new metamodel for schemata/mappings
Save and load from filesystem ->physical independence of ScheReg being live
(from redmine: issue id 499, created on 2018-01-22tgradl, closed on 2018-01-24)
Save and load from filesystem ->physical independence of ScheReg being live
(from redmine: issue id 499, created on 2018-01-22tgradl, closed on 2018-01-24)