Ticket 292: Add case-insensitive normalization-insensitive comparisons

mdmkolbe writes on Slashdot:

Given that on a system with Unicode, you almost never want to do a non-normalizing case-insensitive match and that it is hard for a user to efficiently implement their own normalizing case-insensitive match, it seems an odd corner of the rectangle to omit.

Cowan writes:

Alternatively we could specify that -ci procedures always normalize, or that -ni procedures are always case-insensitive, since the details of the normalization are not exposed anyway.