Restructure uni-*.ini configs as a single base config (uni-hier.ini)

with a bunch of variants that include this and then just do deltas.
Note how much shorter the files are!  It's much easier to see what's going on,
too.  For example, is it intentional that uni-hier-compressed does not set
do_data on the L2 (though it does on the L1 & L3)?
Also got rid of a couple of old broken ones (uni-default and uni-perfect-L2).

--HG--
extra : convert_revision : 70a12c06a8deb9b1c59def313b48f69ab62efce2