exerciser dt/at after sev 2 10), flush, then delete the first one and
flush. The archive gets trashed, because the record's fileOffset wasn't
getting updated properly.
instead of a "doClose" argument. NufxLib should no longer try to free
anything allocated by the application (or vice-versa).
The DataSource "copy" function now does refcounting instead of copying.
This was done as part of cleaning up some memory leaks in the DataSource
code.
The samples were all updated with the changes to the API (and the
occasional minor valgrind-inspired bug fix).
