Todonepy

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- ``to done`` notifies you when it can't delete a task

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- Remove ``pandas`` requirement in setup.py

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- Suport nargs for the ``tasks`` parameter of ``to do`` and ``to done``

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- BREAKING: Move to ``TODO.tsv`` for prettier printing.
- BREAKING: Args are now passed for to in reversed order. Call as ``to do {rank} {task}``
- BREAKING: ``to do`` now sorts new tasks automatically, unless told not to
- Commands now type check inputs
- Pandas dependency now longer required for sorting
- Filer class now uses ``csv`` module for handling files

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- Add ``pandas`` to setup.py

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- Remove broken test