Merge from vendor branch TNF:

Merge from vendor branch TNF:
Import tex-hyphenat-2.3c as print/tex-hyphenat.

This package can disable all hyphenation or enable hyphenation of
non-alphabetics or monospaced fonts. The package can also enable
hyphenation within 'words' that contain non-alphabetic characters (e.g.,
that include underscores), and hyphenation of text typeset in monospaced
(e.g., cmtt) fonts.