Updated jpaper to v2.2.0.

This version of jpaper adds two new options:

* marginnotes: Disabling this option suppresses the display of margin
  notes.

* border: Disabling the option causes all pages to be reduced to nearly
  zero. Users should normally use the new meta-option "tablet" instead
  of using this option directly to produce a document version that is
  laid out identically to the non-tablet version, but is much more
  readable on devices such as tablets.