Add function to get node coordinate units #89
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This PR adds a new BMI function, get_grid_coordinate_units, that allows a BMI user to get the units of each grid coordinate.
The function is patterned on the existing get_var_units function, which accepts a variable name as a string and returns the units of the variable as a string. For get_grid_coordinate_units, the input name is a coordinate: currently "x", "y", or "z", but this could be extended as BMI is extended to handle more dimensions (see #88).
This change is part of the BMI 2.1 Milestone. The BMI version has been incremented to v2.1-beta.
This fixes #87. See #90 (comment) for some discussion on this new function.