undo a previous commit in 9d283a93b5825c25611eff37459ea87794d03df3, that is, in IndexReader::createBarrelReader(), instead of always using MultiIndexBarrelReader, use SingleIndexBarrelReader when there is only one barrel.
undo a previous commit in 9d283a93b5825c25611eff37459ea87794d03df3,
that is, in IndexReader::createBarrelReader(), instead of always
using MultiIndexBarrelReader, use SingleIndexBarrelReader when there is
only one barrel.

pombredanne/izenelib,pombredanne/izenelib,izenecloud/izenelib,izenecloud/izenelib,pombredanne/izenelib,izenecloud/izenelib,pombredanne/izenelib,izenecloud/izenelib