Rule API revision - Githubissues

Rule.left_sibling and Rule.right_sibling had misleading documentation stating that "no parent" or "inconsistent state" raised ValueError. However, "no parent" raised a different kind of error, while "inconsistent state" was explicitly hidden by the implementation. Fixed "no parent" not to raise, but "inconsistent state" to do raise and error.
Rule.replace, UnparserRule.insert_child, and UnparserRule.add_child did not ensure that the node to be added to the tree was removed from its parent (if it had any). Fixed to remove the added node from its original parent.
Rule.delete got renamed to Rule.remove to better describe its functionality (the node is not deleted, only removed from its parent).
UnparserRule.last_child property setter was removed, since UnparserRule.last_child = ... was equivalent to UnparserRule.last_child.replace(...) (actually, a bit even worse). Even the examples and tests used the latter approach.
UnparserRule's and UnlexerRule's initializers got new arguments to enable the explicit setting of all fields (UnparserRule.children, UnlexerRule.size).
JsonTreeCodec updated to make use of the new initializer arguments.
copy.deepcopy of any node copied the whole tree as it walked along the parent chain by default. Added __copy__ and __deepcopy__ to nodes to explicitly control copying. Shallow copies are disabled, deep copies only copy subtrees (without copying ancestors as well).

renatahodovan / grammarinator