added drimmel map

[jan-rybizki]

It seems to work fine. So the mwdust map and the here implemented map give the same results for the points queried, but the interpolation gives different results for other line of sights (not centered on the hpx). One problem that occured was that the data_dir changed name. Could not really get hold of it, but I guess that will be no problem for you to spot. At the moment I am hosting the drimmel healpix --> extinction map.

[jan-rybizki]

Ahh, Ron reminded me to point to the Drimmel Data Dir: ftp://ftp.oato.inaf.it/astrometria/extinction/

[jan-rybizki]

And you should mention that we queried the drimmelmap via mwdust