[isabelle-dev] Isabelle2019 release fork point

[Makarius]

We are now past the fork point for the Isabelle2019 release. This is a
summary of the status of the Isabelle development process:

    * https://isabelle.sketis.net/repos/isabelle-release is where
      the finalization of the release happens, before roll-out in
      the first half of June 2019. The starting point is changeset
      ad0306b89cfb (Isabelle2019-RC2).

    * https://isabelle.in.tum.de/repos/isabelle is already back
      in post-release mode (changeset a8238fd25541).  Anything
      pushed to the isabelle-dev repository is for the next
      release after Isabelle2019.

    * AFP (presently at 2170a6647f04) needs to be understood wrt.
      isabelle-release at the moment. Gerwin will explain when and
      how the fork of afp-devel vs. afp-2019 happens (presumably
      within the next few days). Only after the AFP fork, both
      lines of development are fully independent.

    * https://isabelle.sketis.net/devel with the automated
      testing and snapshot service follows the isabelle-dev
      repository. There is no automated testing for the
      isabelle-release repository (this limits further changes
      to really important things).

    * The isabelle-release repository has no public push access.
      Any changes that are relevant for the release need to be
      sent to me via email (produced by "hg export" or "hg
      bundle"). Changesets need to be prepared from a current
      state of isabelle-release, not the ongoing post-release
      development, and applied to only one of the two repository
      branches.

    * isabelle-users is the place to discuss Isabelle2019-RC
      versions.

    * isabelle-dev is the place to discuss ongoing post-release
      development.


	Makarius