Remove TrueCrypt support (Closes: #7740).
Adjust documentation to reflect the fact that TrueCrypt was removed.
Remove documentation bits about using the TrueCrypt software.
Add a note about the TrueCrypt removal.
Merge remote-tracking branch 'origin/devel' into feature/7740-remove-truecrypt

Conflicts:
	features/truecrypt.feature
Remove the TrueCrypt wrapper.
Don't explicitly install the "expect" package: we don't ship the TrueCrypt wrapper anymore.

If something else needs it, it'll pull it via dependencies. `git grep expect --
auto config` is empty, and I don't think any custom .deb of ours uses it either.
Simplify sentence
Shorten introduction

Now that we don't include TrueCrypt and that it is not developed anymore we
don't need to justify why anymore.
Format alternative as tip
Move fact to the top
Rename TrueCrypt as 'Opening TrueCrypt volumes using cryptsetup'

We don't ship TrueCrypt anymore and this was the only section left on this page.
Fix formatting

You need to format full HTML inside <div>
Rephrase

- Use 'you' instead of 'one'
- Reuse the title of the page we link to
- Add DocBook classes
- Indicate on which version TrueCrypt was removed
Fix typo in CSS class name.
Merge branch 'stable' into feature/7740-remove-truecrypt
Add draft call for donations
Fix date
Remove solved issues (#7232, #7131)
Simplify