Merge branch 'devel' into testing
Generate an UDF without upgrades for the next release's RC as well.
Remove test that is now automated, add one that is not yet.
Update testing process a bit.
Tests++
Remove duplicate section.
Document a bit better how to test incremental upgrades.
Explain how to compare ISO image sizes
Online anonymity test already allow to check User-Agent
Explicit the CTCP command test
Explain where to find the Tor stable version
Improve the description of the bridge test
Improve the Tor tcpdump test
Riseup forces SSL
Improve the internationalization tests
Link to a PDF with tons of metadata
Replace old tails_todo shortcuts
Fix markup
Enter sudo password using keyboard navigation only.

This requires that setting the sudo password is the first thing we do
after opening the Greeter's options screen.
Fix test command.