[dev] vCard Export Patch

[Chuck Hagenbuch]

Quoting Frank Rosquin <frank.rosquin at gmail.com>:

> This patch will enable "export as vCard" in Turba's export panel.
> The format it produces is the same as a normal vCard, except it
> appends each additional vCard behind the last one.
> As such, the output is one file, with multiple vCards in it.

Cleaned up to not put Turba calls into Horde_Data and committed - thanks!

-chuck

-- 
"But she goes not abroad in search of monsters to destroy." - John 
Quincy Adams