Add "handle signals" to todo
Refactor "print debug" into its own method
Refactor out constants and motions
Add pycache to gitignore
Add "x" command
Import letters and digits, don't write manually
Remove extraneous blank line
Refactoring motions should've affected todo
Add feature-list to todo
Add p to todo
Add Buffer.all_lines()
Improve motion description
Improve motion description again
...improve motion doc again
Add operators.py. Just doc -- none implemented
Add CHARACTERWISE and BLOCKWISE constants