Develop ice extraction issue

Solves issue #3 , opened by @fmassonnet

add siasiesiv to the list of postprocessing that need the extraction of ice files from the tar file.

Develop testeleftheria

The bug of usalc is fixed here.

This test is not suitable anymore since the naming convention has changed in diags to be the same as MMO

if several members, oce will exist for previous members whereas sstsssmld rather for the followings so that lstfiles can be empty

if only one chunk, cdo mergetime is not useful and it would not work because the input and output files would have the same name

oce needs to be before sstsssmld so that oce is not already in the workdir when sstsssmld is treated

sstsssmld has been updated in the online postprocessing to oce for compatibility with PA changes - if case for backward compatibility

sstsssmld has been updated in the online postprocessing to oce for compatibility with PA changes - if case for backward compatibility

These lines constrain the post-processed years to be only full years. This had to be the case when ocean_pp.bash was initially developped but it is not the case anymore since about 2 years