[OpenFontLibrary] Din and Helvetica

[Paulo Silva]

as Dave know, recently i were working a bit over some Din Schriften
Engshrift, which seems to be strongly based on Prussian Railways
master drawings. - linked it somewhere at openfontlibrary wiki page ;)

i didn't know Helvetica were that based on Bodoni - would be
interesting having some access to the original Haas-Grotesk master
drawings, which have some differences from Helvetica (and even more
from Helvetica Neue) - the best i could find about Giambattista
Bodoni's Manuale TIpografico were here:
http://www.rarebookroom.org/Control/bodtip/index.html