Default Ellipsoid improvements

microseconds added to juliandate

Fixed numpy divide by zero error converting ECEF for multiple locations.

Don't skip Beta calculation if some values would divide-by-zero.

vdist, vreckon: add deg= option (default true)

ecef2geodetic: scalar-in, scalar-out

Bugfix: don't use numpy.seterr

use warnings.catch_warnings() context manager instead of numpy.seterr to avoid breaking other programs that import pymap3d and want their warnings not to be errors.

Thanks @sanguinariojoe for the report and suggested fix

overhaul Ellipsoid, fix Numpy warning to error

• Numpy would issue warnings that could cause incorrect computations by not being caught in try: except: for things like divide by zero. This has been fixed.
• overhaul the Ellipsoid() class
• apply good coding style and use only pyproject.toml (no setup.py, setup.cfg)
• Require Python >= 3.8: Numpy NEP29 dropped support for Python < 3.8 in December 2021.
  We are having a harder time supporting corner cases in Python 3.7.

project PEP517

thanks @EpicWink

add spherical<->geodetic transforms, enhance inputs and testing

lookAtSpheroid allows all inputs to be arrays of same shape

add functions spherical2geodetic, geodetic2spherical thanks @leouieda

remove internal "use_astropy" option

add mathfun.py to abstract numpy/math fallback

remove most numeric type hint

The type hinting for most numerics was removed to avoid causing external package problems as per #50. thanks @randallpittman
The CI coverage was improved by testing each supported Python version across MacOS, Linux, and Windows.
The PEP621 pyproject.toml meta was removed to avoid duplication and conflicts with setup.cfg. thanks @philblckwd

ecef2geodetic stability with float32

enhance ecef2geodetic stability with float32

loxodrome_direct stability near asymptote

Thanks to @noritada for finding and making tests for loxodrome_direct issues. Always appreciate hearing where the test suite isn't covering a broken case.

used numpy.broadcast_arrays to simplify code.

loxodrome_direct stability near asymptote, enhance CI

CI tests Python 3.7...3.10

Added stability to loxodrome_direct for azimuth = {90,-90,270,-270}
enhanced efficiency of loxodrome_inverse for stability

speed imports, add -m pymap3d.{vdist,reckon}

Don't automatically import less widespread used modules including:

    lox
    los
    rcurve
    rsphere

this speeds imports for most users.

add command line convenience functions:

python -m pymap3d.vdist
python -m pymap3d.vreckon