cf_units has similar functionality

[aaschwanden]

The cf_units module (https://github.com/SciTools/cf_units) provides a similar functionality, e.g.

            from udunits2 import Converter, System, Unit
            sys = System()
            c = Converter((Unit(sys, inunit), Unit(sys, outunit)))
            outdata = c(data)

is equivalent to

            from cf_units import Unit
            in_unit  = Unit(inunit)
            out_unit  = Unit(outunit)
            outdata = in_unit.convert(data, out_unit)

@ckhroulev : you may consider dropping support for py_udunits2?

[ckhroulev]

Agreed.