[isabelle] Isabelle2016-RC4 available for testing

Dear Isabelle users,

Isabelle2016-RC4 is now available for further testing, and regular use in anticipation of official Isabelle2016:


This corresponds to the repository versions https://bitbucket.org/isabelle_project/isabelle-release/commits/Isabelle2016-RC4
and https://bitbucket.org/isa-afp/afp-devel/commits/100836987bd3

Summary of notable points:

  - more robust Sledgehammer preplay phase
  - more reactive GUI updates
  - minor tuning and polishing

After 5 weeks of testing, extremely few problems have been exposed. This means we are converging to Isabelle2016 -- this is probably the last release candidate before final lift-off.

People who have used earlier release candidates should upgrade now. Local settings can be preserved by copying $ISABELLE_HOME_USER in a suitable manner: renaming the last component of the directory name to Isabelle2016-RC4 before starting the new version.

When discussing problems, observations, suggestions, etc. the mail subject line should be changed to something informative (but the release candidate number still given in the message body).


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