Adjoint overlay

[philippjfr]

Implement overlaying of AdjointLayouts as originally outlined in #987.

[jlstevens]

A screenshot/example would be good to illustrate the new behavior.

[philippjfr]

Here's an example:

hv.Image(np.random.rand(10,10)).hist() * hv.Text(0,0, 'A') 

Works the same for HoloMaps and DynamicMaps:

hv.HoloMap({i: hv.Image(np.random.rand(10,10)) for i in range(5)}).hist() * hv.Text(0,0, 'A') 

The overlaying of adjoined plots works too, however overlaid adjoined plots don't behave particularly well currently so I'll open another issue about that. For now it's mostly useful for being able to overlay the main plot.

[jbednar]

Thanks!

[jlstevens]

Looks good - happy to merge once it is ready and the tests pass.

[philippjfr]

Travis has somehow decided not to run a PR build, or it's just being slow.

[philippjfr]

Looks like it's not going to, but there should be no failures in this PR and since the branch is up to date with master the push and PR builds are equivalent anyway. Merge away once it passes.

[philippjfr]

Appears to be an persisting py3 issue, so going to have to start another build anyway.

[philippjfr]

Ready.

[github-actions]

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