sch-rnd - use cases 
 The "transistor" problem 
 Setup 
	-  sch -> pcb flow
	
-  generic (light) symbol in the schematics (e.g. a generic NPN)
	
-  footprint attribute set to a generic footprint (e.g. a generic sot23)
 Problems 
	-  the pin numbering of the symbol is arbitrary
	
-  the pin numbering of the footprint is arbitrary
	
-  a footprint+NPN doesn't determine the pinout: there are various NPN devices with different pinouts with the same footprint
	
-  number of logical pins may not match number of physical pins; unused pins, mutliple pins connected