FIX: redistributePar problems with lagrangian

- the fileHandler changes included setting cacheLevel(0) to avoid
  blocking with redistributePar. However, this meant if clouds
  were not uniformly present on all ranks the fileHandler would follow
  different code paths and lead to blocking.

  Now switch to distributed mode for the lagrangian operations within
  redistributePar based on the cacheLevel information.

FIX: avoid triggering a false processor check in argList

- when redistributing to few ranks