Changes in 0.17.4:
------------------
* Don't let "twocolumn" tables collapse in Mallard documents (Shaun McCance)
* Use AC_MSG_* when checking for gnome-doc-utils, #571300 (William Immendorf)
* Work around buggy OpenSolaris awk (Shaun McCance)
* Substantial changes to xml2po (Claude Paroz)
* Work on xml2po Mallard mode (Shaun McCance)
* Fix misspelling of 'description' (Tommi Vainikainen)
* Updated translations:
  bg    (Alexander Shopov)
  de    (Mario Blättermann)
  es    (Jorge González)
  et    (Ivar Smolin)
  fi    (Tommi Vainikainen)
  fr    (Claude Paroz)
  ga    (Seán de Búrca)
  gl    (Antón Méixome)
  hi    (Rajesh Ranjan)
  it    (Milo Casagrande)
  nb    (Kjartan Maraas)
  ta    (drtvasudevan)
  th    (Theppitak Karoonboonyanan)