It was needed to :
 * Add a Utf8 to local conversion for filename/filepath string vector property server side
 * Modify the way the vtkPVReaderFactoryHelper handle the CanRead method, so a utf8 to local conversion is done
 * Add a vtkPVDirectoryProxy so all directory manipulation goes though it allowing for a utf_ to local conversion
 * Modify some QString::toLocal8Bit to QString::toUtf8 because we now provide conversion server side
 * Modify some QString::toLocal8Bit to QString::toUtf8 because they were incorrect since there was already a conversion done server
 * Improved the xml test
 * Documentation