Need to segment target output in XLIFF filter writer if TU is segmented

Created by: Anonymous

Original issue 132 created by @ysavourel on 2010-03-26T13:49:14.000Z:

When using the XLIFF filter, the writer needs to generate segmented
if the target resource is segmented. But leave the un-
segmented even if the resource is segmented.
This probably mean a dedicated XLIFFFilterWriter.