Csdmpy

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Feature
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- Convert negative increment CSDM object to positive increment CSDM object.
- Accepts both C and F contiguous numpy array to convert to CSDM object. 57
- Add `csdm.reshape(dim1, dim2)` to CSDM object to reshape a CSDM object to the
given list dimension object---`dim1`, `dim2`.
- Numpy broadcasing mulipllication can now be applied to csdm objects.
- Support for additional numpy methods `np.pad` and `np.flip`.

Bugfix
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- fft and ifft scale the first point by 2 when the dimension is non-periodic.
- Bugfix in serializing csdm 54
- You can multiply CSDM objects by a scalar to the right (`csdm * scalar`). The fix
now allows the multiplication of CSDM objects by a scalar to the left (`scalar * csdm`). 62
- Bugfix where csdm objects `.csdfe` files were immutable.

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What's new
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- Add support for ``np.cumsum``, ``np.cumprod``, ``np.argmin``, ``np.argmax`` functions to CSDM objects.

Bugfix
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- Bugfix involving plot of datasets with dependent-variable quantity type of `vector_1` or `pixel_1`.
- Bugfix when assigning DimensionList/DependentVariableList to the CSDM dimensions and dependent_variables attribute 45
- Bugfix in CSDM object serializing when using Astropy.units v4.0 and higher. 44
- Bugfix for incorrect class name. 39

Deprecated
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- `add_x`, `add_y` functions are removed.

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Patch update for the CSDM dimension's ``quantity_name`` attribute value from units compatible with astropy>=4.3

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What's new
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- The ``add_dimension`` and ``add_dependent_variable`` from CSDM class are deprecated.

Bugfix
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- Fixed error in calculating the nmr dimensionless frequency ratio (ppm) when dimension.complex_fft=False

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- Fix the missing library error from pip installation.

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Changes
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- Image and Contour plots of csdm objects no longer draw colorbar. Colorbar can be
requested separately using `plt.colorbar()`.