[DOC] LaTeX: Fix preamble
[DOC] LaTeX: Fix preamble

Memo: latex_preamble got removed from Sphinx at 1.6.1, and old
LaTeX package expdlist requires a fix else it breaks LaTeX
if a description list is in a table cell, and it causes anyhow
many LaTeX complaints about Underfull box (badness 10000).
The fix for these complaints is copied over from
https://github.com/scipy/scipy/commit/c881fdea7a7ef7c518b789
and it turns out it is also a fix for the crash in case
a description list is in a table..

mhvk/numpy,madphysicist/numpy,abalkin/numpy,grlee77/numpy,simongibbons/numpy,grlee77/numpy,simongibbons/numpy,mhvk/numpy,endolith/numpy,mattip/numpy,numpy/numpy,mattip/numpy,rgommers/numpy,simongibbons/numpy,abalkin/numpy,grlee77/numpy,abalkin/numpy,numpy/numpy,pdebuyl/numpy,numpy/numpy,pdebuyl/numpy,pdebuyl/numpy,madphysicist/numpy,rgommers/numpy,simongibbons/numpy,anntzer/numpy,seberg/numpy,jakirkham/numpy,seberg/numpy,grlee77/numpy,WarrenWeckesser/numpy,mattip/numpy,jakirkham/numpy,charris/numpy,mhvk/numpy,WarrenWeckesser/numpy,madphysicist/numpy,rgommers/numpy,numpy/numpy,pbrod/numpy,rgommers/numpy,endolith/numpy,seberg/numpy,simongibbons/numpy,anntzer/numpy,mhvk/numpy,charris/numpy,WarrenWeckesser/numpy,madphysicist/numpy,grlee77/numpy,WarrenWeckesser/numpy,endolith/numpy,jakirkham/numpy,mattip/numpy,mhvk/numpy,pbrod/numpy,pbrod/numpy,charris/numpy,endolith/numpy,jakirkham/numpy,pbrod/numpy,pbrod/numpy,madphysicist/numpy,WarrenWeckesser/numpy,anntzer/numpy,jakirkham/numpy,pdebuyl/numpy,seberg/numpy,anntzer/numpy,charris/numpy