"Manual Data Model Evolution" add to docs

The document “Manual Data Model Evolution” at:
http://root.cern.ch/root/html/io/DataModelEvolution.html

is very useful, but hard to find. Can this be added to the User’s guide? There is no other user’s guide documentation of the “#pragma read” style manual data evolution.

OK we will try to find some place in the users’ guide

root.cern.ch/download/doc/InputO … pabilities