NEWS: Start to update in preparation for 1.3.1 release.

git-svn-id: file:///home/xapian-svn/xapian/trunk@17036 6b2f1b92-a4f3-0310-943f-de3cbe41748b
HACKING: Update link to new home of autotools tutorial.

git-svn-id: file:///home/xapian-svn/xapian/trunk@17037 6b2f1b92-a4f3-0310-943f-de3cbe41748b
tests/api_stem.cc: Extend stem2 to ensure description of the stemmer
isn't the same as the description of Stem("none").  Fix description
of testcase stemlangs2.

git-svn-id: file:///home/xapian-svn/xapian/trunk@17038 6b2f1b92-a4f3-0310-943f-de3cbe41748b