Fri Apr 1 22:30:26 EDT 2011

Powering target from PK2

It's possible but needs some massaging.  I'll need to recover the
exact sequence, but the basic idea is to:

 * Check if there is target power, and ONLY switch on the PK2-provided
   line if there is none!

 * Set the reset/program line correctly.

Need to make sure that device is properly configured, so we can get
the right operating voltage from the database.

Actually, the default works for a 5V PIC, without target voltage
checking.  The current `target-on' and `target-off' functions work
fine from reset.