LINMA2460: Add answers to some exam questions

[Peiffap]

Supersedes the allQuest document in the summary folder on the Drive. I had to hack the "unknown year" into it, as discussed.

This is the PR I was referring to in #830. I'm also tagging #782, which is relevant as the "unknown year" document has all questions for the course, and hence this PR introduces some redundancy (which IMO is still less of a problem than having to switch back and forth between pdfs all the time).

[Jimvy]

Sinon ce serait pas mieux d'étendre smartcp pour gérer ce cas explicitement ? Enfin, si on trouve que ça peut être applicable à d'autres situations.

[Peiffap]

I'm more convinced by JM's idea; there are definitely cases where such "unknown" years could occur, and it would be needlessly confusing and "dirty" to add a random year where this is not needed.