Clldutils

- https://github.com/clld/clldutils/issues/87
- https://github.com/clld/clldutils/issues/88
- https://github.com/clld/clldutils/issues/89

Bugfix release

Bugfix release

- Support for converting geo coordinates to "human readable" notation.
- Support for cli using proper argparse subparsers.

Fixes the wheel distribution which included the obsolete dsv module.

- dropped support for py < 3.5 (in particular, py2.7 is no longer supported)
- removed already deprecated clldutils.misc.cached_property
- removed legacy module clldutils.dsv
- deprected a couple of functions which are (almost) aliases of stdlib functionality
for py > 3.4.