SnowProduct: handle copernicus format

Handle the copernicus archive format in the SnowProduct class for lis synthesis

assigned to @pty_

mentioned in merge request !88 (merged)

mentioned in commit 05a195bc

closed with merge request !88 (merged)

reopened

Need to add tests

assigned to @dupuisa and unassigned @pty_

created branch 92-snowproduct-handle-copernicus-format to address this issue

mentioned in merge request !91 (merged)

mentioned in commit cd7164bb

closed with merge request !91 (merged)