a2vimode v0.5 - AppleSoft integration features

In this release of a2vimode, the following features have been added (see the manual for complete usage information):

• Proper ProDOS support, protected from BASIC
• AppleSoft integration features—auto-increment line numbers, summon lines from BASIC into the prompt, scroll back and forth through BASIC lines!
• Undo
• Recall last-typed line
• Jump-to-Char
• BASIC programs to switch a2vimode into 80-column, or back to 40-column

What's coming next?

Expect the following features in an upcoming release:

• Direct, in-prompt support for switching in and out of 80-column mode
• Screen-copying feature, to replace the firmware's built-in feature via ESC
• Fix for using ESC on an unenhanced Apple IIe in 80-column mode
• Support for alternate keybindings, such as Emacs, or WordStar (note: not all features may be supported with alternate keybindings)
• Less-awkward location in memory freeing up more RAM for BASIC programs and data
• An interactive tutorial (maybe?)