Rework and expand the algorithms in JSCAN, part 3/?.

Rework and expand the algorithms in JSCAN, part 3/?.

* Have the debug dump print out raw record transaction id's.
* Fix a number of bugs in the prefix set code (the files were being
  strtoul'd in base 10 rather then base 16).
* Make multiple commands on the command line work (e.g. -w and -m together).
* Fix a few jseek() bugs.
* Add '-f' which operates like tail -f and allows a batch operation on e.g.
  a prefix file set to poll for more data.

Still TODO: ACK protocol, raw output (-o/-O) protocol, temporary mode for
record files (-W), and many other things.