was not giving the full path to each file and ignoring the `prefix`
field. On investigation, the field is only to be used if the filename
is longer than 100 bytes. Since the library code had been simplified to
always use the prefix field this caused all filenames shorter than 100
bytes to fail.
Also updated `package-bootstrap` to the latest patch release, which has
a fix for completions being installed into the base directory rather
than the appropriate subdirectory.
