….py, RELEASE, doc/source/archive.rst, doc/source/intro.rst: Add ability to archive larrys that have dates (datetime.date) as labels.
larrys from the archive. Use the new delete function in IO.__delitem__. * doc/source/archive.rst: Work on the IO section of the manual.
io and io/tests. Move contents, io.py and io_test.py, to la and tests, respectively.
npz.py and move it to a new subpackage named io.
…y data * io.py(save_npz), io.py(load_npz): Improve doc string. * README: Tweaks.