Expand this lab

[NicMcPhee]

This lab is too short for a week; many groups finished or nearly finished it in one 2 hour lab session. It should either be expanded some or the array problems should be merged back in.

[NicMcPhee]

As noted on the next lab, we may want to drop the mergesort problem from that array. So we could just bring array_merge into this lab.

Alternatively, we could drop palidrome since it's just a chance to play with valgrind (or move it into the pre-lab), find a replacement for mergesort, and then have a single lab that is disemvowel, array_merge, and the replacement for mergesort.

[NicMcPhee]

Life is weird - this semester most groups are still struggling halfway through the second lab period with the same "too small" version of the lab. So I'm not sure I believe it's "too small". It's unclear whether the difference is the students, or the prep (I did very little lecturing this semester), or just magic weirdness of the world.

[NicMcPhee]

This project is being archived, so I'm closing all the issues, etc.