- Update some very old licenses in src/cats.

- Modify the database format for handling Migration jobs:
   Add PriorJobId, RealEndTime to Job table
   Delete MAC table
   Remove Stripe from JobMedia record (not used, wasting space)
   Add ScratchPoolId, RecyclePoolId, Enabled to Media record
   Add Cost to Location table.
- Delete mac_record subroutines.
- Add new table values to create/update/get routines as appropriate.
- Update the update_tables and make_tables scripts.
- Make a first cut in using a union where multiple pointers (actually
  pointers to pointers) are stored.
- Make some changes to base64.c suggested by Robert and others and add
  a small amount of documentation.
- Add some changes suggested by Peter for Solaris (bregex...)
- Make runscript.h always built because it needs to be pulled into
  more places.  In particular its RES was left out of a union.
- Renumber the enum{} list in runscript.h to avoid starting from zero.
  This makes it slightly easier to detect uninitialized variables.