Tool for managed setup of data directory

- tool for registration and management of particular dataset cloning
Schemas registration by _index.json in dataset

- schemas are defined in dataset
- changed configuration
Support for restriction of allowed fs operations over REST Api

- fsController now allow configuration of allowed operations
Fixes in schemaController

- fixed path manipulation
- fixed error state checking
Menu configuration moved into dataset

- menu fragment moved into dataset to allow dataset specific menu
- created read-only fs controller to access dataset data from client