* Add some small bits of system information (OS, libspectrum
version) into creator custom data for formats which support this.
* QNX6 compilation fixes and package file.
* rzxcheck: return 1 if the RZX file does not have a good signature.
* rzxdump: use libgcrypt 1.1.42 or later.
* snap2tzx: new utility to convert snapshots to tape files.
Heavily based on Tomaz Kac's 'z802tzx'.
* tapeconv: remove double-free bug if tape reading fails.
* Working 48K/128K/+2/+2A Speccy emulation, running at true Speccy speed on any
computer you're likely to try it on.
* Support for loading from .tzx files.
* Sound (on system supporting the Open Sound System or BSD/Solaris).
* Kempston joystick emulation.
* Emulation of the various printer you could attach to the Spectrum.
* Very basic support for RZX files.
Changes 0.6.1:
* Add `snapconv' utility to convert between snapshot formats
(Philip Kendall).
* Add `rzxcheck' utility to verify the digitial signature in an
RZX file (Philip Kendall).
* listbasic: a line number of >= 16384 implies the end of BASIC,
not just > 16384 (Darren Salt).
* listbasic: formatting improvements and support for 128K and
TC2068 keywords (Darren Salt).
* listbasic: add man page (Philip Kendall).
* Various improvements due to libspectrum changes: notably support
for Warajevo .tap files and many more snapshot formats.
