Document the deprecation of ERR_STATE and ERR_get_state()
Changes between 1.1.1 and 3.0.0 [xx XXX xxxx]
+ *) Deprecated the public definition of ERR_STATE as well as the function
+ ERR_get_state(). This is done in preparation of making ERR_STATE an
+ opaque type.
+ [Richard Levitte]
+
*) Added ERR functionality to give callers access to the stored function
names that have replaced the older function code based functions.
