Aotools

- Added tools to convert Magnitudes to photon flux and back again (thanks james-m-osborn !)
- Can specify random seeds in FT phase screens (thanks ojdf !)
- Lots of conversions between turbulence units (thanks james-m-osborn !)
- Progress on documentation and testing (thanks matthewtownson !)

- Additional Documentation
- Added some more tests
- Moved `opticalpropagation` library to main namespace

Add the README.md to the package for a PyPi long description

Small updates to fix versioning and preparation for pip upload....

Massive code restructure and some additional tools.
Split code into a more logical structure.

Additions:
- Infinite Phase Screens
- Slope Covariance Matrix Generation

Bugfixes:
- Fix Scaling Issue with Physical Propagation Intensity
- Fix Strange Zernike Function Edge Effects

Release that has been used in some projects. Big structure changes coming after this...