MINYANVILLE ORIGINAL Ironic in the week America gives thanks for that time in 1620 when English separatists made a break from the Mother Country on the Mayflower but a British software stock called of all things Autonomy yesterday disastrously ensnared its new owner on this side of the Atlantic.    Hewlett-Packard (HPQ)  unloved and disowned plunged 11.95% to single-handedly drop the Dow (^DJI) into negative territory on the day. This after $8.8 billion worth of accounting “improprieties ” to use a $10 word the company can now ill afford were alleged at a tech firm founded in the same hallowed halls of ...