and I'm not sure what my name is... so there are probably bugs. Please play
with this stuff and try to break it.
This commit also includes permissions editing that actually (finally!) lets you
create new group->dataset associations after the dataset already exists.
Currently the only entry point is from the Library, but the "display a group's
datasets" page can now be extended to contain useful information about
associated datasets (like whose history a dataset is part of and what folder a
dataset is in) to make it actually, like, useful and stuff.
Nate Coraor
b1caa7431a