Log Message:
Update to 1.0.16. From the changelog:

flint backend:
* Fix a typo which stopped this fix in 1.0.12 from working (ticket #398):
  If we fail to get the lock after we spawn the child lock process (the common
  case is because the database is already open for writing) then we now clean
  up the child process properly.

documentation:
* Improve API documentation of QueryParser::set_default_op() and
  QueryParser::get_default_op().

portability:
* Fix build failure on Mac OS X 10.6.