[isabelle-dev] NEWS: Updated and extended manuals

[Makarius]

* Updated and extended manuals: "codegen", "datatypes", "implementation",
   "jedit", "system".

This refers to Isabelle/96f970d1522b.

The list of updated manuals is based on a quick glance over the repository 
changes, and may be incomplete.  Maybe the maintainers of manuals want to 
check if it makes sense.

I've spent myself very pleasant weeks in the Perigord Noir, to do maybe 
2000km of cycling and 40 pages of manual updates.  The Isabelle/jEdit 
manual is now quite substantial.  I've enjoyed editing it with 
Isabelle/jEdit itself (on a very old 2-core Mac Book Pro), using the 
Console/Scala shell to run the Build_Doc.build_doc jobs.  Apple 
full-screen mode now also works nicely, if the icon in the window corner 
is used, not the jEdit menu entry.


 	Makarius