fw functions

hi,

the latest patches in my hackerlab archive include:

- tests for non-native byte order conversions between unicode
  encodings

- documentation improvements on several unicode-related files

- bug fixes (i think) in ustr.c functions, which mixed byte and code
  unit lengths

- untested implementation of udstr_*_fw functions. more concretely, i've
  implemented: udstr_save_fw, udstr_save_n_fw and udstr_copy_fw: do we
  need any other?

i will be writing unit tests for ustr.h and udstr.h, and go on to
implementing the bogus encoding scheme, unless you have a better plan
:)

cheers,
jao
-- 
Any sufficiently advanced technology is indistinguishable from magic.
-Arthur C Clarke, science fiction writer (1917- )