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Use logical instead of physical path for locating WM_PROJECT_DIR
As experienced by @ivanspisso during installation, the current use of pwd -P makes the installation in some cluster environments more difficult since the physical path may correspond to some arbitrary disk and not to the canonical name.
For example,
OK: /cineca/prod/opt/applications/
NOK: /marconi/prod/opt/applications/
NOK: /galileo/cineca/prod/opt/applications/