NEWS: Update from ChangeLog.

git-svn-id: file:///home/xapian-svn/xapian/trunk@16984 6b2f1b92-a4f3-0310-943f-de3cbe41748b
omindex.cc: When generating a sample for a CSV file, limit the
reserved size to the CSV file size as sample_size could be set
really high by the user.

git-svn-id: file:///home/xapian-svn/xapian/trunk@16985 6b2f1b92-a4f3-0310-943f-de3cbe41748b