moved ci_build module to build_ci;

overhauled ci_build: clarified, removed unused, removed implicit Jenkins assumptions;

tuned;

tuned;

add root entry for non-local components;

clarified;

extra timer delay, to limit db transactions;

proper synchronized;

clarified ternary tries

clarified test parameters;

more tests: Windows + AFP (see also 1fd5f96e1da3);

dropped references to theorems from transitional theory Divides.thy

Tidied some messy proofs

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;