i700: Improved motor commissioning

Function extension:
The 'Motor Commissioning' tab for the i700 servo inverter has been improved in several aspects:

• Input fields and buttons were arranged more evidently. Three subtabs ('Motor', 'Encoder' and 'Controller') were provided for this.
• Parameter setting for Rated motor current (0x6075) and Maximum device current (0x6073) has become easier.
• The behaviour of the user interface during encoder commissioning has been improved.