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Changes from V8.4
=================
+Vernacular commands
+
+- Undo and UndoTo are now handling the proof states. They may
+ perform some extra steps of backtrack to avoid states where
+ the proof state is unavailable (typically a closed proof).
+- The commands Suspend and Resume have been removed.
+- A basic Show Script has been reintroduced (no indentation).
+
Tactics
- Tactics btauto, a reflexive boolean tautology solver.
Program
+
- "Solve Obligations using" changed to "Solve Obligations with",
consistent with "Proof with".
- Program Lemma, Definition now respect automatic introduction.
+CoqIDE
+
+- Coqide now supports the Restart command, and Undo (with a warning).
+ Better support for Abort.
+
+
Changes from V8.4beta to V8.4
=============================