Xtgeo

* Preliminary support for Python 3.8 (Linux only)
* Several bug fixes:
* User warning when requested colour map is not found
* Printing of a Points of Polygons instance shall now work
* UNDEF values in property (b)grdecl export shall now be 0.0, not a large number
* Name in GridProperty `to_file(name=...)` is fixed
* If `fformat` in GridProperty import is mispelled, an exception will be raised

* Added support for MacOS on PYPI (Python 3.6, 3.7)
* Added functionality on grid slices as method ()
* More flexible reading on phases present in Eclipse/IX UNRST files
* Several minor bugfixes and improvements

* Support for macos

* Fix a few bugs regarding xsection creation when too few points present
* Automatic deploy of Windows builds to PYPI