Merge branch 'bug325'
Merge branch 'master' of https://github.com/pgmodeler/pgmodeler into develop
Changed the way inheritance is created. Now the INHERIT command is
appended in the table's definition

Update on model validation. Generalization and copy relationships have
the participant tables ids validated in order to check reference
breaking.
Minor fix on disconnection of generalization relationships.
Minor fix in updating table's graphical representation when importing
primary keys.