Version 2.0

The upgrade to version 2.0 involves three significant changes and a code reorganization, so is considered a major revision and is given a new leading version number. In order of importance, the changes are: (a) to change from tile sizes that are fixed by the user to
those that are chosen automatically depending on expected wavelengths, (b) to change
from solving for three variables, k, α, and φ0, at each map point to solving for only k and α,
and (c) the introduction of a much better algorithm to find seed values for k and α before
the nonlinear search for each tile
Contributors: @RobHolman @bergsmaE