1.7.1:
* Incremented version for new tarball.
1.7.0:
* Add public mtbl_threadpool API, enabling multithreaded functionality
for mtbl_writer and mtbl_sorter objects; see mtbl_threadpool manpage
for more info.
* Add mtbl_writer_options_set_threadpool() to enable multithreaded
data block compression.
* Add mtbl_sorter_options_set_threadpool() to enable multithreaded
sorting.
* Add -t option for setting the preferred number of threads to use in
an mtbl_threadpool object used for writing in mtbl_merge.
Bump PORTREVISION of dependent ports.
Sponsored by: DomainTools LLC
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