lloda/ra-ra: A C++20 array and expression template library with some J/APL features @ v21

lloda 4f8647abf5 Bump version to v21		1 éve
..
CMakeLists.txt	f0905ae4c5 Updates to the manual	3 éve
SConstruct	2e491f9ab2 Fix auto rename error	4 éve
headers.png	ddfd55f706 Fix check for out-of-context ra::len	1 éve
index.html	4f8647abf5 Bump version to v21	1 éve
my-bib-macros.texi	509bf27cb5 Check compile time sized expressions at compile time	6 éve
ra-ra.bib	509bf27cb5 Check compile time sized expressions at compile time	6 éve
ra-ra.texi	4f8647abf5 Bump version to v21	1 éve