[PATCH 0/8] Print refactoring

[James Youngman]

These changes are the first part of a refactoring of find's
print-related code.  They:

- move this code out into a separate file
- add some tests
- explicitly reserve the %{, %[ and %( format specifers (previously
  these were unused).

These things still need to be done:

- refactor insert_fprintf into smaller functions
- remove the scan/scan2 wart from the current insert_fprintf code
- document %B better, fix %B@ on non-birthtime-supporting systems.
- better test coverage for %y (character devices, loops, broken
  links)
- test %S, %i, %Z
- find a way to test the time-related formatting (perhaps using
  faketime).