Resqpy

This patch adds an optional vdb_property_list argument to the import functions:

- import_nexus()
- import_vdb_all_grids()

If the property list (of Nexus keyword-style grid property names) is supplied, then only those properties are imported (and then only if the original boolean arguments controlling static and recurrent property import are set True).

Nexus is a trademark of Halliburton.

This patch exposes the make_aps_key() function for public use, when working with AttributePropertySet objects.

This release introduces an AttributePropertySet class for accessing a property collection and property metadata using python object attribute syntax.

This patch allows the year offset in timestamps in a geological time series to be zero.

Included in this patch:

- a new Surface.edge_lengths() method returning the lengths of the triangle edges
- a fix for a bug affecting the numpy dtype of the triangles data in the Surface.resampled_surface() method

This patch adds an extra_metadata optional argument to TriMesh.from_tri_mesh_and_z_values()