* Deep gets on nodes with keywords returns an enum like the regular get.
* Fix rare failures of `wait_for_state_change` function that resulted in early timeouts.
* All keywords on nodes are correctly supported, and not only the first one for each option.
* Function `wait_for_state_change` now supports strings and enums for keywords nodes.
* Fix 252. ListNodes now also supports numpy integer types as index argument.
* The function `check_zsync_connection` of PQSC now raise an error if the port is in a faulty
state, instead of return False.