Fix #303506 partly by joostvdl: remove the country code from paths to private...

Fix #303506 partly by joostvdl: remove the country code from paths to private image files used in generating PDFs
Use hook_node_* instead of hook_nodeapi_* in line with changes to Drupal 7
Simpler fix to #388008: Use a 'heavier' weight even in the absense of the CCK module