PCC

1. Partial coherence module built and tested, fits a Gaussian blurring kernel (S. Maddali et. al., Phys. Rev. Applied 14, 024085, 2020)
2. New README page and tutorials with Jupyter notebooks.
3. NEW LOGO!

Python-based BCDI phase retrieval for CPU+GPU

Starting versioning at v2.0.0, will backfit v1.0.0 to branch tensorvlow-1.x sometime in the future.