FIGI — String: explicit exclusion of vowels

Raised by Tom Rutt:

6.1.2 Characters 4-11: The table for checksum, and the conformance excludes the characters A, E, I, O, U . This text should be explicit that the values exclude the use of these vowels. It should have an explicit list of consonants and the letter Y.

String: explicit exclusion of vowels

Rather than merely stating that all consonants are permitted in section 6.1.2, list the entire set of permissible characters as follows:

"o The exact list of permissible letters is B,C, D, F, G, H, J, K, L, M, N, P, Q, R, S, T, V, W, X, Y, Z "