Doxygen: fix proprietary browser references

Doxygen generates API reference documentation from special comments extracted from source files.

It supports generation of graphs using 'dot', part of GraphViz. These graphs can be generated as SVG files, but not all browsers suport SVG. So if SVG isn't supported, a list of suggested browsers is displayed to the user browsing the generated webpages. By default the list contains proprietary browsers.

This patch changes that list to suggest only freedom respecting browsers (which support SVG rendering).

I also filed this issue to the gnu-linux-libre mailing list, but got no feedback so far. I decided not to wait and fix this issue here in Trisquel.

See merge request !59

make-zam-plugins

Add new helper for Debian testing package.

See merge request !54

Belenos

I've encountered a problem when I tried to create a configuration file on my home directory. When I tried to execute the "compton-launcher" it didn't launch compton but the following message appeared:

parse_config(): Failed to read configuration file "~/.config/compton.conf

Replacing "~" with the environment variable "HOME" solved the problem.

See merge request !52

Remove z88dk nonfree files

See http://www.z88dk.org/forum/viewtopic.php?pid=8504. The package z88dk was blacklisted, but the files with noncommercial restrictions are not required (test suite and keyboard driver), so I made a package helper to remove those files. Requires ubuntu-purge!11.

See merge request !49

README -> README.md

Since these repositories are hosted on `gitlab` I thought it was nice to have the `README` in markdown format.

See merge request !48

Add make-tcltrf helper

This helper replaces the nonfree code for the RIPEMD hashing algorithm with free code that I wrote and was included in Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=751879.

See merge request !47

Fix copyright file for grace

The copyright file of grace was taken from labplot, a completely different package. The only thing in common is the cephes library. I replaced the copyright file with the correct one from the Debian grace package.

See merge request !46

Update grace copyright

Closes FSDG https://trisquel.info/en/issues/12192

See merge request !44

Remove nvclock

Removed in ubuntu-purge/master:46110

See merge request !43

The package is no longer useful

Bugfix aptitude

Update ubuntu's patch so it works with Trisquel

Fixes http://trisquel.info/en/issues/13044

See merge request !39

postgresql branding issue

Closes http://trisquel.info/en/issues/13149

See merge request !40