Help with constrained_layout

Hi all,

I know a lot of bandwidth has been taken up w/ the 2.1 release, but that
seems to be settling down now. I?ve been working hard on the
constraint-driven layout. This is an alternate to `tight_layout`, and
based on [kiwi-solver](
I think its mostly feature-complete at this point, and handles numerous
situations not handled by `tight_layout` like `suptitle`, over-spilling
legends, colorbars that belong to a group of axes (as opposed to just
one axis), nested gridspecs, etc. (Conversely, it doesn?t work at all
w/ `plt.subplot` or `plt.subplot2grid` because each call to these
functions makes their own gridspec, and we do the layout within
individual gridspecs).

I?m writing to appeal for some help testing this, or coming up with
situations that I didn?t think about. There is one request for
AnchoredOffsetBoxes, which I haven?t done yet, but I think that is a
0.2 feature once folks think the basic idea is OK. I?m also more than
open to addressing any implementation concerns/suggestions.

Right now, automatic installation only works with python 3.6 because we
require kiwi-solver gitub master version for python 2.7. But you should
be able to install with `pip install .` into a virtualenv.

There is also a guide in
`tutorials/intermediate/`. It probably still
has some rough edges, but suggestions welcome.

Thanks for any help.

Cheers, Jody
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