Status information on the partner list

[nthiery]

At this stage of the project, there has been quite some personnel movement, including, sadly, two deceased participants. We should reflect this on the partners page. I have updated the data, adding a status=left/retired/deceased. This should be trivial to implement once we have decided how exactly we want to display the information. I am not sure on the best wording for "left the project". Do we want to be more specific?
For deceased participants, we may want to add a link to the obituary.

cc: @VivianePons, @bpilorget

[fangohr]

We could use 'former' project partner to express 'left' - same meaning, but may sound more positive. I don't think we need to differentiate between leaving the project for some reason or retirement (or even death) - the page is to acknowledge contributions these people have made while being part of the project.

(We could and should link to obituaries where available.)