VAX: Added Register Bit Field definitions for the PSL register
VAX630: Added register bit fields for the watch device and read/write tracing for watch register activity.
VAX630: Added register bitfields for the IPC (Doorbell) register and read/write tracing.
VAX630: NVR corrected to be 64 bytes instead of 128. Added NVR read/write debug tracing.

   - Fixed broken NVR Examine/Deposit
   - Added SHOW CPU LEDS
VAX630: Fix watch chip behavior the first time a file is attached to the NVR device.
sim_debug: Fixed to produce output when the format string is a bare newline character.

Fixed bitfield output to properly present the prefix when appropriate.

This closes issue #62