Added Turbo Mode - This allows the emulator to run faster than a real TRS80.
It is turned on/off using the F11 key. By default, when on, the emulator runs
5 times the speed of a normal TRS80, however, the rate is adjustable through
the text GUI, Macintosh Preferences, or command line/configuration file options.
Changed Disk Drive Numbering to Start With 0, not 1 - The intial release of the emulator
numbered floppy drives from 1-8 and hard drives from 1-4. However, TRS80 drives started
number at 0, so this was very confusing for users. This has been changed in this release,
however, note that configurtaion files and command line options will need to be changed
by users to account for the numbering change in -disk and -hard options.
Added more keys definitions to key documentation, per bug reports
