* Added -DisMenu command line option to disable the menus.
* Fixed issue where sound output stops after about 10 mins.
* Corrected the fix in v3.8 for sound artifacts. Sampled sound works correctly again.
* Added periodic noise emulation tweak from Rich Talbot-Watkins.
* Updated instructions for defining user keyboard mappings (thanks to Jonathan Bluestone).
* Bug fix - Cursor position wrong when in column 1 in editing mode.