Bump version number to 3.2.1

--HG--
branch : 3.2
Added tag 3.2.1 for changeset 6b38706d90a9

--HG--
branch : 3.2
Regression test for bug 752
(transplanted from 576120ad694efe29b70999576964d3816288fb4e)

--HG--
branch : 3.2
extra : transplant_source : Wa%20%ADiN%FE%29%B7%09%99Wid%D3%81b%88%FBN