20200318

* add support for NetBSD 9.99.30 and newer
* set minimal version to NetBSD 9.0
* picotrace: support POSIX_SPAWN
* common: Regenerate for syscall.h 1.308
* truss: support POSIX_SPAWN
* coredumper: support POSIX_SPAWN
* singlestepper: support POSIX_SPAWN


20190526

* picotrace: enhance spelling and formatting of the documentation.
* picotrace: set close-on-exec on the output log.
* picotrace: fix uninitialized memory read in copyinstr()
* common: correct detection and distinguishing of events
* coredumper: initial version.
* truss: initial version.


20190507

* picotrace: initial version.
