Log Message:
Update to 1.20:

* Version 1.20 (released 2011-03-01) [?]

** libidn: Fix bug in ToUnicode to compare 'xn--' case-insensitively.
The problem is typically noticed when an upper ACE case string is
converted to Unicode.  Before, this would return the input rather than
converting the ACE form to Unicode.  Reported by Stepan Golosunov
<stepan@golosunov.pp.ru> in <http://bugs.debian.org/610617>.

** tests: Added self-test tst_idna3 to catch any regression of problem above.

** idn: Only print copyright and license blurb when used interactively.
Reported by "Andrew O. Shadoura" <bugzilla@tut.by> and Roman Mamedov
<rm@romanrm.ru> in <http://bugs.debian.org/615947> and
<http://bugs.debian.org/615949> respectively.

** Update gnulib files and translations.

** API and ABI is backwards compatible with the previous version.