Madcubapy

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- Changes:

- Add compatibility of ``add_colorbar`` and ``insert_colorbar`` with
``matplotlib.axes.Axes``.

==========================

- New features:

- Add ``measure_noise`` function.

- Add an ``update_sigma`` method to ``MadcubaMap`` to measure the noise and
save it in the FITS header.

- Add interaction module with ``get_input`` function.

- Add a ``get_input`` method to ``MadcubaMap`` to do the same.

- Add ``show()`` method to ``MadcubaMap``.

- Changes:

- Rename ``append_colorbar`` to ``insert_colorbar``.
- Change ``width`` parameter to ``size`` in ``add_colorbar`` and
``append_colorbar``.
- ``MadcubaMap`` method ``convert_unit_to`` now converts the SIGMA header
card if present.

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- Finish main functionality for Madcuba fits maps.

- ``read()`` and ``write()`` methods implementations.
- Automatic history file updating.

- Add ``filename`` attribute to ``MadcubaMap`` and ``SpectraContainer`` to allow
tracking.

- Create functions to operate on map data.

- Add the emission of any given number of maps with ``stack_emission``.

==========================

- Add ``copy()`` methods to ``MadcubaMap`` and ``SpectraContainer``.
- Add ``quick_show()`` and ``are_equal()`` functions.
- Add unit conversor for ``MadcubaMap``.

==========================

Add ``fix_units()`` method to fix incorrectly parsed units in a ``MadcubaMap``.

==========================

Add hist table updater to ``MadcubaFits``, to write new history into the file.