change default polymorphism encoding methods
in a series of tests on available examples, lightweight polymorphism encoding techniques combined with a more agressive generation of monomorphic instances (via Discriminate) show better results than our earlier defaults. In the same commit: - remove Encoding_explicit (unsound), Encoding_decoexp (too naive), and Encoding_instantiate (subsumed by Discriminate) - rename Encoding_decorate to Encoding_tags_full and Encoding_guard to Encoding_guards_full - move Encoding_guards_full specific functions from Libencoding to Encoding_guards_full - do not apply type protection in "encoding_tptp" and remove Protect_finite which is not needed anymore.
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