fix: incomplete renaming
polish: more readable libsodium-func-args
test vector 00 works!
remove the blocksize from bytevector-join
simplify getting bv-length: just map bytevector-lenght over bv-list

This removes the blocksize optimization
implement split and join of bytevectors
step 6 done: store padded data
move base16-{en,de}code into base32.w
fix convergent encryption test
use correct libsodium constants instead of local constants
working convergent encryption