Wiggelen

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Release date to be decided.

- Accept float threshold in ``wiggelen coverage`` command line interface.

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Released on May 3rd 2014.

- New ``--share-y`` and ``--y-lim`` options for ``wiggelen plot`` command.
- Command line or importable definition of custom merge function for
``wiggelen merge`` command.
- Optionally only report posititions in regions defined by the ``--genome``
argument for ``wiggelen fill`` command.

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Released on February 17th 2014.

- Command line interface to `wiggelen.fill`.
- Fix off-by-one error in reading genome file argument in ``wiggelen plot``
command.
- New merger functions `ctz` (*c*losest *t*o *z*ero), and `max` (thanks Jeroen
F.J. Laros).

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Released on November 29th 2013.

- New merger functions `min`, `div`, and `intersect` (thanks Jeroen F.J.
Laros).
- Discard `None` values when writing.

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Released on September 2nd 2013.

- Auto scale tracks in distance calculation if needed (the metrics in
`wiggelen.distance` are not defined on the (0, 1) interval).
- Add min,posmin,max fields to track index.
- Optionally consider edges in `wiggelen.fill` (`only_edges` argument).
- Introduce the `plot` module for visualizing tracks.
- Rename command line ``visualize`` function to ``plot``.

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Released on August 8th 2013.

- Support `fixedStep` definitions without `step` argument. This is not valid
by the spec, so a practical consideration. Fixes
`issue 1 <https://github.com/martijnvermaat/wiggelen/issues/1>`_.