Updated some archaic proofs

tuned def: patter matching needs more beautification

removed lemma wellorder.wfP_less

merged

enforce rebuild of Isabelle/ML;

clarified signature;

Base64: proper support for large Bytes, with subtle change of types (Bytes instead of String);

tuned: prefer Bytes operations;

unused;

proper treatment of long message blocks;

clarified sizes;

more scalable stream read operations;

minor performance tuning;

tuned;

tuned module structure;

tuned names;

imitate internal policy of ByteArrayOutputStream: capacity is doubled after first push;

tuned whitespace;

unused;

Bytes.Builder is unsynchronized, like java.io.OutputBuffer;

notable performance tuning: avoid overhead of higher-order functions;

more efficient equals: avoid somewhat slow sha1_digest (see also 29b761e290c5, 306f273c91ec);

more scalable compression, using Bytes.Builder.Stream;

tuned: more uniform, less ambitious;