Changes from Mercurial (hg http://isabelle.in.tum.de/repos/isabelle/ default)
Summary
- more Isabelle/ML/Scala operations;
- more Isabelle/ML/Scala operations;
- more Isabelle/ML/Scala operations; clarified errors;
- proper src1, amending 20157c8ab3f3;
- tuned;
- proper File.eq, amending df49ca5da9d0;
- tuned;
- clarified modules: more like ML;
- obsolete;
- tuned;
- more direct make_directory in ML and Scala, but ssh still requires perl for Windows UNC paths (see a5dbad753552);
- discontinued somewhat pointless "integrity test of build_history": it fails right now, but also failed to expose spurious incompatibilities when it was working;