[isabelle-dev] NEWS: THEN_ALL_NEW in Isar method expressions

[Makarius]

* Structural composition of proof methods (meth1; meth2) in Isar
corresponds to (tac1 THEN_ALL_NEW tac2) in ML.

This refers to Isabelle/49e498cedd02, which also contains minimal 
documentation.

It is a tiny spin-off from reforms stemming from the Eisbach project.


Gladly, TTY mode was already discontinued, so that the keyword ";" was 
again free for this important combinator.


 	Makarius