Fixed connector naming
Corrected Bus circular shifting methods
Added ipynb example for Bus
Add ipynb example for Linker
Added python script for ipynb examles of Bus, Connector and Linker
AnalogBuffer : Updated triggering to work when attenuation changes
Minor fixes to example in sig_gen module
Added ipynb example for Analog Buffers
Added ipynb example for Analog converters
Added ipynb example for Analog Signal Generators
Added .py files for the analog modules examples