Changes from Mercurial (hg https://foss.heptapod.net/isa-afp/afp-devel/ default)
Summary
- Update ROOT...
- Appendix with another axiom system as a variant of the proof.
- adapt to Isabelle@769a7cd5a16a
- merge from afp-2021-1
- adjust Lar's contact info as requested
- sitegen for Padic_Field
- new entry: Padic_Field
- sitegen for Risk_Free_Lending
- new entry: Risk_Free_Lending
- new entry Implicational_Logic
- New entry Separation_Logic_Unbounded
- added web files
- added web files
- New entry SCC_Bloemen_Sequential