update to hydrogen 0.9.6 (actual release.)

includes:
- fixes for NetBSD
- cppunit tests
- pulseaudio support (not yet enabled?)
- several new --options
- fixes for JACK support (this, and the NetBSD fixes remove all our
  local patches!)
- fixes for drumkit loading
- wants newer libarchive than NetBSD or pkgsrc have; use libtar for now
- updates to playlist support
- uses snprintf() over sprintf()
- better undo/redo support
- copy/paste support for particular notes
note hydrogen 0.9.6 update.
enable portaudio-devel now that it has a supported version.
now csound6 can output directly to the audio card on netbsd.
add comments to all the patches that were missing them.
bump pkg version.
Avoid MACHINE_ARCH for static file, fixes 64-bit build.
+ csound6-6.03.2.