v4.100.257

Library

• Import adds books, and lists the files it can take. The Library
  panel's Import… opened only .gz files, and read whatever it was given
  as a Library export: an EPUB given to it failed with
  incorrect header check. The dialog now lists every type a book is read
  from, and the export's .gz, first, then all files, and several can be
  picked at once. A Library export is imported as before; any other file
  becomes a book, titled from the file, on the shelf that is open or on
  Unsorted / Imported. A book that looks like one already there is left
  out, with the reason.