Also the file numbers can thus be reused.
Don't pass the BRT into the flush commands, since the BRT may no longer be present.
Put a counter in to see how many rollback records are present.  (Addresses #698.)
Increment the file version to 4.
Fixes #545, #703.

Note: All the tests pass except
 * Many cxx tests are getting valgrind errors.  (Addresses #716.  Possibly causes #716.)
 * {{{test_log9.recover}}} fails with "Binary files ... differ".  These will presumably be fixed by #711 or #714.  (Addresses #711, #714.)
 * {{{test_log10.recover}}} fails.   There are two failures:
  1. A valgrind problem (see #718.)  (Addresses #718.  Possibly causes #718.)
  1. The "Binary files ... differ" issue.


git-svn-id: file:///svn/tokudb@3486 c7de825b-a66e-492c-adef-691d508d4ae1