Welleng

A quick update with a couple of functions in `utils` for conversion between decimal lat/lons and degrees, minutes and seconds.

Minor release to squash a bug in `connector.Connector` where `_target_pos_and_vec_defined` would go into an infinite loop of `pos1 == pos2`.

This hopefully sorts some formatting of docstrings in the documentation also, but shouldn't break anything.

Rather than rely on your directional driller for survey parameters in your header or for converting between WGS84 and map projections, there's a `SurveyParameters` class in the `survey` module for doing it.

Also added to the `utils` is a function for calculating annular hole volumes, very useful when used with `utils.ureg` for easy unit conversions.

Small changes and bug fixes, so nothing should break.

Someone pointed out that some of the examples were no longer working after the major update to 0.7, so this is now fixed along with some minor updates.

Hopefully this should work on colab, but if not try using:

python
!pip install git+https://github.com/jonnymaserati/wellengmain


else:
python
!pip install welleng --use-pep517