* Update texcmp
I found that the existing docker rules for texcmp did not make a working
installation of LaTeX; in particular, it was missing a lot of the recently
added packages. I updated to Ubuntu 17.10 and tweaked the package listings
until things compiled again. Now I can run texcmp again.
* texlive-font-utils not necessary
* Update texcmp to ubuntu 17.04 and avoid mounted host directory
Switch to linux 17.04 in order to have a version of nodejs which understands
ES6 syntax, for the sake of a consistent codebase.
Avoid mounting the host directory, but use “docker cp” instead to transfer
files between host and container. This should avoid ownership and
permission issues.
Support macros with positional arguments.
Fix one overline example which caused LaTeX failure due to missing braces.
* Extract texcmp results as current user
This allows running the texcmp.sh script using sudo on afs.
* Change texcmp conversion to gray
As per #708, this should increase compatibility with older versions of
imagemagick, and might also do a better job of preserving the original sRGB
color space.
* Abandon tar and use plain docker cp instead
Thanks to Erik Demaine for suggesting this.
* Move npm install into creation of texcmp docker image
The same test cases we use for our screenshots from Firefox are now also
being rendered by pdflatex, so the resulting images can be used as reference
for how things are supposed to look (if we concentrate on compatibility with
LaTeX). To make comparisons even easier, the differences between LaTeX and
Firefox snapshots are rendered in a visual way, using different colors.
Discussed in pull request #268.
