bugfix: lib/sh/resume_import.sh: $preamble_file: use the extension .0.preamble.sql instead of .preamble.sql so the preamble file sorts before the other *.sql files
bugfix: lib/sh/resume_import.sh: $preamble_file: use the extension .0.preamble.sql instead of .preamble.sql so the preamble file sorts before the other *.sql files