generate-global-id: return normally when content file not found; add -t for sha1sum to keep system independency
delete-hash-list-item: sed command bug fixed and simplified; add update-hash-list-item
add move-hash-list-item
add add-hash-list-item
remove option checking; support filenames with blanks; change the text format a little for generating global id
generate-global-id: make it simple