pulling recursion in earlier

[maryfries]

• Unit 1: more complicated who (drafted and under review)
• Unit 2: fractal triangle (already there) move in some/all of U7 (with most of it as ITITs, TIFs, or optional projects and really just one new required page—either tree or the second input for the triangle fractal) (leave U7 where it is)
• Unit 3: have them build vee (perhaps in L2, renaming the lab something like "graphics and lists")
• Unit 4: Binary Conversion (8.3.3) along with U6L2, which we are now thinking will go with U4, and 8.3.4 as a TIF (there is still debate about what algorithm to use for the conversion, elegant but hard vs. accessible, and what words to use, number vs. decimal) - this will be an experiment (lower priority)
• Unit 5: uniques—the page that started this whole discussion.