Issue 2297909 by fgm: Relocate product types below Commerce / Configuration.
Merge pull request #13 from FGM/2297909-product-types-configuration

Issue 2297909 by fgm: Relocate product types below Commerce / Configurat...
Issue #2297989 by fgm: prevent deletion of Order Types with exising Orders.
Issue #2297989 by fgm: Prevent product type deletion when a product exists.