Suggestion/Bug fix: support \tightlist

[briatte]

Pandoc (at least until version 1.17) treats

- a
- b
- c

as a tightlist, using the \tightlist command when converting to TeX.

By default, the latex-ms template does not understand that command, and breaks if the document contains such a list.

The problem does not reproduce if * is used instead of - to build the list, which I find a bit puzzling to be honest.

Anyway, "tight lists" can easily be supported by copy-pasting this bit of code in the preamble of the TeX template:

\providecommand{\tightlist}{%
  \setlength{\itemsep}{0pt}\setlength{\parskip}{0pt}}

[svmiller]

Easy enough addition. Pretty sure that came standard in the default pandoc template but my smashing of that template left a lot of things like that on the cutting floor.

Thanks for this and the other suggestion.