* New features:
* Grid quality indicators for Grid(): ``get_gridquality_properties()``.
* Support for BytesIO i/o for ``RegularSurface()`` formats irap ascii and zmap ascii.
* A `fmt` key is now available in `GridProperty().to_file()` for Eclipse grdecl
format, and default format is now scientific %e for Floats.
* Added a key `datesonly` for GridProperties().``scan_dates`` for getting a
simple list of dates existing in a given restart file.
* Added a ``strict`` key to ``GridProperties().from_file()`` method.
* Added ``Points().from_dataframe()`` method.
* Added bulk volumetrics ``Grid()``: ``get_cell_volume()`` and ``get_bulk_volume()``
as experimental methods.
* Added ``percentiles`` option for ``Surfaces().statistics()``.
* Improvements and bug fixes
* Reorganizing internal storage of 3D corner point grids.
* Faster read and write to ROFF binary for Grid() (read almost 4 times faster).
* Faster read/write to Roxar API for grid geometries.
* Import from Eclipse is improved, in particular using "all" alias for
``initprops``, ``restartprops`` and ``restartdates``.
* Fix issues 414, 415, 418, 421, 423, 426, 436, 439.