DOC: Update tutorial on error handling

Summary

The error handling has been updated in the tutorial (see #52 (closed)). Also, #49 (closed) has been fixed on the way.

Focus

src/doc/tutorials/erros.rst

Test Environment

make doc on top level and look at build/doc/html/tutorials/errors.html.

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src/doc/tutorials/errors.rst

@@ -47,10 +47,10 @@ errors<EntityError>` which you can inspect in order to learn why the
 transaction failed. For this inspection, there are some helpful
 attributes and methods provided by the ``TransactionError``:
 
-* ``entities``: a set of all entities that caused at least one error
+* ``entities``: a list of all entities that caused at least one error
   in this transaction
 
-* ``errors``: a set of all ``EntityError`` objects that occurred during
+* ``errors``: a list of all ``EntityError`` objects that occurred during
   the transaction.
 
 * ``has_error(error_t)``: Check whether an error of type ``error_t``
@@ -78,12 +78,20 @@ with only one item—``[self]``.
 Special Errors
 ~~~~~~~~~~~~~~
 
-Subclasses of ``EntityError`` for special purposes: \*
-``EntityDoesNotExistError`` \* ``EntityHasNoDataTypeError`` \*
-``UniqueNamesError`` \* ``UnqualifiedParentsError`` - overrides
-``get_entities()``: returns all parent entities with errors. - overrides
-``get_errors()``: returns a list of EntityErrors which have been caused
-by parent entities. \* ``UnqualifiedPropertiesError`` - overrides
-``get_entities()``: returns all properties with errors. - overrides
-``get_errors()``: returns a list of EntityErrors which have been caused
-by properties.
+Subclasses of ``EntityError`` for special purposes:
+
+* ``EntityDoesNotExistError``
+
+* ``EntityHasNoDataTypeError``
+
+* ``UniqueNamesError``
+
+* ``UnqualifiedParentsError``
+
+* ``UnqualifiedPropertiesError``
+
+* ``ConsistencyError``
+
+* ``AuthorizationError``
+
+* ``AmbiguousEntityError``