added event register set/gets added function to read the compressor state
added event register set/gets
added function to read the compressor state

margguo/python-ivi,sephalon/python-ivi,adrianschlatter/python-ivi,alexforencich/python-ivi,Diti24/python-ivi,getzze/python-ivi,dracorpg/python-ivi,elopezga/ErrorRate,dracorpg/python-ivi,python-ivi/python-ivi