LXVII versions

v1.7 [Oct 14, 2022]
Fixed the notorious crash when selecting "Show registers" caused by the deprecated window drawer interface.
Redesigned the buttons to better reflect the color scheme of the HP-67 calculator.
Added support for dark mode on macOS versions that support it.
Expanded the help files to reference information on the original HP-67, as well as expanding the descriptions on some of the LXVII specific features.

v1.5 [Jun 29, 2011]
- Delete when inputting a number now deletes the digits that have been entered.
- Copy/Paste now works for the number in the display. Please note that it will convert the number from the proper floating point format to the display format as appropriate.What that means is that if you copy a number that is showing the exponent (for example "1.23-025") what you will paste is 1.23E-25. In the same way, pasting the number "12.33E13" into LXVII will display "1.233014"Trying to paste "1.233014" into LXVII will result in a beep, and no change to the stack. The pasted number will always push the stack up. Copy/Paste to and from the stack and memory register display still works as usual.
- The paper tape panel has been greatly enhanced. It now has an automated mode which prints the display and operation that was executed and a trace mode that will print each step in a program as it is executed. There is a preference pane to control how it works, and a help page dedicated to explaining it.Bugs Fixed:
- The display routines have been generally cleaned up to do a better job with rounding numbers and handling overflow/underflow situations.
- General bug fixes in program execution and some of the calculations in the less common functions, including hour, minute second to decimal hour conversion.