Data Base Function added to Die container

Test system function is now totally isolated from the DataBase code.
Measurement table fields are part of the Die class.  The Die class now
takes responsibility for data base record insertion at test time.
Network analyzer functionality added.

Vector Star code is working with the prologix usb device.
Added cascade prober class

prober object is ready to test. based on experience with the Vector
Star the prober should work out of the box.
data base schema

added other tables to schema to account for common test items.
Testing Started today

device characterization loop first use.