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updated NEWS according to d38a98f496dd (see also bdc2c6b40bf2);

stick to external proofs when invoking E, because they are more detailed and do not merge steps

more robust handling of types for skolems (modeled as Frees)

tuning

repaired named derivations

use the noted theorems in 'BNF_Comp'

use the noted theorem whenever possible, also in 'BNF_Def'

use termtab instead of (perhaps overly sensitive) thmtab

use the noted theorem whenever possible, because it has a named derivation (leading to cleaner proof terms)

tuned message;