@hackage generics-mrsop-gdiff0.0.2

Here we port the gdiff algorithm and library to work over the generics-mrsop, enabling code that relies on the later library to access the gdiff algorithm. Moreover, we also bring in the utilities for converting a gdiff patch into a more structured version, facilitating merging. For some literature on the topic check Arian's MSc thesis at https://dspace.library.uu.nl/handle/1874/380853 or our TyDe 2017 paper at https://victorcmiraldo.github.io/data/tyde2017.pdf.