unforking repositories
Some repositories are forks of some external repos. This creates problems when submitting PRs. It would be better if those were unforked. Admin would need to contact GitHub support and ask them to effectuate it. 
- [x] https://github.com/kaitai-io/kaitai_struct_csharp_runtime

Procedure explained at
https://stackoverflow.com/a/44140289/2375119
When contacting staff, please mention to keep "fork forks" on our network. 