Changes since tag v21

commit 056d5b5d6c406934c1470931ed09409202eacd82
Author: (rowaasr13) Oleg V. Volkov <rowaasr13@gmail.com>
Date:   Mon Mar 29 23:34:26 2021 +0300

    verification/profiling concluded: remove old engine, its data file and verification/profiling harness, only new engine is active now

commit a7f77aa898bc0ec2d6eb6b32282cd6987aaa8833
Author: (rowaasr13) Oleg V. Volkov <rowaasr13@gmail.com>
Date:   Sun Mar 28 21:55:50 2021 +0300

    THIS ALPHA COULD BE SLOWER: import and activate new engine side-by-side with old and report matching stats/profiling in devel mode

commit 884bfdf8d65949c2ad84d9a995b028d188833561
Author: (rowaasr13) Oleg V. Volkov <rowaasr13@gmail.com>
Date:   Sun Mar 28 21:45:42 2021 +0300

    initial import of tree-format data for upcoming new engine

commit be46034c4364864f6923c4dc7f6c85db204985be
Author: (rowaasr13) Oleg V. Volkov <rowaasr13@gmail.com>
Date:   Sat Mar 27 15:58:41 2021 +0300

    extend old patterns, new patterns from EU-Kazzak and some from EU-Blackrock (de) that happened to fit into language-neutral patterns, remove some longer patterns already covered by shorter - sync to generator commit dd7ed38dc72b46a2f9d190446c399b2be9bca049

