Adjust to DIO spec change. Add right gripper close-open.
(nextage_client) Add print digital-in feature that is tailored for NXO dio setting.
(nextage_client) Simplify method to not require complicated value from upstream lib.
(nextage_client) Add group-based convenient methods for reading DIs
Merge pull request #88 from 130s/hand_dio_change_717

Adjust to the spec change of DIO. Add a customized read digital input method.