Every dataset now knows its prefix, because it's always stored with the DatasetOrigin, and VERBATIM is gone.
File upload now requires a prefix, so there's a form field to make drop possible.
DatasetRepo now has recordDbOpt which gives you one for the dataset's prefix.
SkosRepo moved to org dir from global.
Merge pull request #31 from delving/single-mapper

Every dataset now knows its prefix, because it's always stored with the ...