* OrderChangeManager: Add support for custom operations
* OrderChangeManager: Add callback to AddPosition operation
This is also meant as a way to fix#5548
* Refs #5557: Checkstyle fix
* Refs #5557: Added tests
* Refs #5557: Changes requested in the PR review
* Refs #5557: Fix error in previous merge conflict
* Refs #5557: PR review
* Orders API: Add check_quotas to orders/change and PATCH/POST orderpositions query params
* Refs #5323: Checkstyle fix
Forgot tu run fkale8 after implementing unit tests oops
* Refs #5323: Fix unit tests and fix of the previous ones
* Refs #5323: PR review