Add a what's new entry for the WebAgg backend

[mdboom]

No description provided.

[takluyver]

This is causing the docs build to fail again:

LaTeX Warning: File `users/_static/webagg_screenshot.png' not found on input li
ne 9577.


! Package pdftex.def Error: File `users/_static/webagg_screenshot.png' not foun
d.

See the pdftex.def package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.9577 ...ics{users/_static/webagg_screenshot.png}

? 
! Emergency stop.
 ...                                              

l.9577 ...ics{users/_static/webagg_screenshot.png}

!  ==> Fatal error occurred, no output PDF file produced!

[pelson]

@takluyver - does adding a leading slash on the path do the trick?

[takluyver]

It fixes that problem, but now I've got another error. The new log ends with:

LaTeX Warning: Hyper reference `mpl_toolkits/mplot3d/api:mpl_toolkits.mplot3d.a
rt3d.Patch3DCollection' on page 507 undefined on input line 28284.

[507]

! LaTeX Error: Too deeply nested.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.28366 \begin{Verbatim}[commandchars=\\\{\}]

? 
! Emergency stop.
 ...                                              

l.28366 \begin{Verbatim}[commandchars=\\\{\}]

!  ==> Fatal error occurred, no output PDF file produced!

[mdboom]

Thanks. I plan to track this down along with any other doc bugs early next week as part of making the release candidate (unless anyone else gets to it first).

[takluyver]

OK. I've disabled the daily build again so as not to contribute to the backlog of builds Launchpad is trying to process. Let me know when you want me to try it again.

[mdboom]

The doc build should be fixed as of 0eea7b8.

[takluyver]

Yep, it's working again.