Changes

Changes from Mercurial (hg http://isabelle.in.tum.de/repos/isabelle/ default)

clarified signature: proper Document.Node.Ordering conforming to equality (e.g. required in situations where theory names are ambiguous due to overlapping session directories);

Changeset 70674:29bb1ebb188f by wenzelm: clarified signature: proper Document.Node.Ordering conforming to equality (e.g. required in situations where theory names are ambiguous due to overlapping session directories);
The file was modified	`src/Pure/PIDE/document.scala`
The file was modified	`src/Pure/PIDE/headless.scala`
The file was modified	`src/Pure/PIDE/resources.scala`
The file was modified	`src/Pure/Thy/sessions.scala`