Merge from vendor branch TNF:

Merge from vendor branch TNF:
Import tex-fancybox-1.4 as print/tex-fancybox. Packaged by Nicolas Thauvin
and updated by me.

Provides variants of \fbox: \shadowbox, \doublebox, \ovalbox, \Ovalbox,
with helpful tools for using box macros and flexible verbatim macros.
You can box mathematics, floats, center, flushleft, and flushright,
lists, and pages.