split into package core (no pack, 'CC' prefix, stable)
and misc where oneshot ideas go
more modules in containers Core;
moved KMP to sublibrary containers_string
many more functions in CCList
more modules in containers_string (CCString, Levenshtein); CCFun.finally
enable warnings
updated and fixed things in core/:
fixed warnings, updated Sequence/Gen with tests and more recent interface; added printers
fixed warnings in Levenshtein
merge with master (AVL)