Move Segment and Sequence classes into instrument Agilent33500B class
Move Segment and Sequence classes into instrument Agilent33500B class

Segment and Sequence are now subclasses of Agilent33500B, to avoid confusion when using together with Keysight AWG.
And fix some bugs :bug:

BBN-Q/Auspex,BBN-Q/Auspex,BBN-Q/Auspex,BBN-Q/Auspex