TODO file (? means the feature may be implemented, but not definitely)
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- Implement Spelling [DONE, mostly...]
- Implement Help [DONE]
- Internationalization [In progress, translators welcome!]
- Allow nano to be resized in X. [DONE]
- Color syntax highlighting? (certainly seems like there's a demand for it.)
- On page up/down, put the cursor on the first line (like Pico), not the
  center line [DONE]
- Undo/Redo key?
- single line scroll up/down?
- Rewrite edit_refresh, if at all possible [In progress]
- Implement justify function [DONE]