Features:
* reading and parsing:
- some older text Palmdoc formats (pdb),
- Mobipocket files (prc, mobi),
- newer MOBI files including KF8 format (azw, azw3),
- Replica Print files (azw4)
* recreating source files using indices
* reconstructing references (links and embedded) in html files
* reconstructing source structure that can be fed back to kindlegen
* reconstructing dictionary markup (orth, infl tags)
* writing back loaded documents
* metadata editing
* handling encrypted documents