Pika string work

Hi!

Now that udstr is mostly on-line, I've gone back to do a bit ore
hacking on Pika strings. However, I miss a few functions to mirrored
at the udstr API:

udstr_make_n -- create new string of given length (in codepoints)
udstr_{case,}cmp
udstr_at/udstr_set

I could well add those, since they should be simple wrappers, but I'd
like to have the interface given first, so they come out right.

Andy
-- 
Andreas Rottmann         | [email protected]      | [email protected] | [email protected]
http://yi.org/rotty      | GnuPG Key: http://yi.org/rotty/gpg.asc
Fingerprint              | DFB4 4EB4 78A4 5EEE 6219  F228 F92F CFC5 01FD 5B62

I have a truly elegant proof of the  above, but it is too long to
fit into this .signature file.