Added 'test' target to build and run tests. Added documentation.
Added README.txt files. Fixing problem with initialization of
the Test::Harness::Straps replacement. Added code to filter out non-
test directories.


unittest/Makefile.am:
  Adding 'test' target to build and run tests.
unittest/examples/skip.t.c:
  Changing text for skip reason.
unittest/examples/skip_all.t.c:
  Changing text for skip reason.
unittest/mytap/tap.c:
  Adding copyright. Adding documentation. Minor code changes.
unittest/mytap/tap.h:
  Adding copyright. Adding documentation.
unittest/unit.pl:
  Initializing replacement Test::Harness::Straps properly.
  Adding code to filter non-test directories from default directories
  to use.
unittest/README.txt:
  New BitKeeper file ``unittest/README.txt''