Todoq

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- Copy README.md to README.txt.
- Fix the link in setup.py.

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- Change the text ui interface of the sub-command add, drop, finish, postpone.
- Remove set_path.
- Minor format change to README.md.

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- Fix the "README.txt not found" error

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- Fix the "directory does not exist" bug in initialization

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- Replace the subcommand sync with set_path

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- All the subcommand except sync work