DOC: Update and extend importance and inheritance

Summary

See #145 (closed). The (in-code and user) documentation of inheritance and importance of properties is fixed and updated.

Focus

specification/ReccordType has been extended and moved to rst. The in-code documentation in org/caosdb/server/entity/StatementStatus has been extended as well.

Test Environment

make doc

Check List for the Author

Please, prepare your MR for a review. Be sure to write a summary and a focus and create gitlab comments for the reviewer. They should guide the reviewer through the changes, explain your changes and also point out open questions. For further good practices have a look at our review guidelines

• 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 spezifications? Are they satisfied?

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

src/doc/_static/css/server_docu.css

+table, .wy-table-responsive table {
+    border-collapse: collapse;
+    table-layout: fixed;
+}
+
+table td, .wy-table-responsive table td {
+    word-wrap: break-word;
+    white-space: unset;
+}