Structure "io_information" in dem.cc

[cleodeletre]

A structure "io_information" could be used in dem.cc for methods that use the same inputs. For example:

particles_force_chains_object->write_force_chains(
parameters,
particles_pvdhandler_force_chains,
this->mpi_communicator,
folder,
group_files,
iter,
time)

[blaisb]

@OGaboriault I'm assigning you this. Or if you want @cleodeletre that could be a small PR to make during your UPIR