Add readingresp2, pset2, v1

For proofreading, etc. Trying the one-paragraph reading response to see how it goes. Last bit of last problem in pset -- too hard? OK? Sequence/stuff building on former things OK? Some code will need to be rewritten, esp if files are gone through w/o being saved in a .readlines() or similar, etc, but we'll talk about that... (Other comments/changes we can make of course.) 

Unable to test everything because I'd pulled the still-broken merge earlier and haven't fixed the migration. Will test tomorrow, etc, but these are still proofreadable.