v0.5

• Fixed the guest command-line buffer's missing trailing space
  (issue #63): whenever a launched program has at least one argument,
  real AmigaOS's own command-line buffer carries a trailing space
  before the final '\n' ("foo bar baz \n", not "foo bar baz\n") -- confirmed directly against real Kickstart 2.0/3.0/3.1
  hardware via a new local, real-Kickstart comparison harness
  (tools/compare_kickstart_versions.py, using Copperline's
  copperhf.device). Kickstart 3.2 alone doesn't add it -- a real,
  intentionally-untouched AmigaOS version difference, not a bug (this
  project targets 3.1 first). Also fixed a real bug found along the
  way in fixtures/echoargs.s/libcall.s: A0 is a scratch register
  across any library call (real Kickstart's OpenLibrary clobbers it;
  volamos's own doesn't), so reading the command-line pointer back from
  A0 after an OpenLibrary call is real-hardware-unsafe even
  though it happened to work under volamos.
• Implemented mathieeesingbas.library/mathieeesingtrans.library:
  the single-precision IEEE math libraries, previously only a fake
  OpenLibrary stand-in with no real function support. Mirrors
  mathieeedoubbas.library/mathieeedoubtrans.library function-for-
  function on plain f32 instead of f64. Fixed a real bug found via
  amitools' own math_single_trans ground truth along the way:
  IEEESPPow's result is y raised to the x power (IEEESPPow(3.0, 4.0) -> 64.0 = 4**3), not x raised to y as a naive reading
  of its .conf-derived argument names would suggest -- tracing this
  down also revealed mathieeedoubtrans.library's existing
  IEEEDPPow already had the equivalent (correct) behavior, just a
  misleading doc comment, now corrected.