F cleanup rules

Summary

After caosdb-server#146 (closed) the rules table and the getRules procedure are obsolete. This MR removes them.

Check List for the Author

• All automated tests pass
• Reference related Issues
• Up-to-date CHANGELOG.md
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there specifications? Are they satisfied?

For further good practices have a look at our review guidelines.

doc/table_structure.md

@@ -150,7 +150,6 @@ Older (i.e. not current) data, from previous versions of an entity which were st
 - permissions
 - query_template_def :: User-defined query templates?
 - roles :: possible user roles
-- rules :: SQL action/verification hooks?
 - stats :: benchmarking?
 - transaction_log :: benchmarking?
 - units_lin_con :: fraction and unit conversion?