Summary
- merge from afp-2017
- recent developments on Perron Frobenius from AFP-devel
- update release list
- add nunchaku expect to submission instructions
- sitegen patch by Lars for new entry dependency checking might still have some issues with isabelle tool resolution in Darwin. To be refactored later.
- add entries that were devel-only
- using AFP entries (for non-editors) is now more uniform
- set AFP and Isabelle version to 2017
- regen website
- update submission instructions