1. Lots of #lang-ization, other racketizations, code improvements, etc.
2. Some files that were not working now do.
3. "collects/tests/aligned-pasteboard" had some files that were near
duplicates of "collects/mrlib/private/aligned-pasteboard/tests".
I've removed the former since in a few places it looked like an older
version (eg, there were bogus references to a non-existent
"utils.rkt"). The former has more files that are in runnable
condition now.
4. There are plenty of tests that look like they're failing, but it
wasn't shown since they just return #f, and when they were running
with a "-f" these results weren't displayed.
5. I have no idea about the code, this is all just reshuffling and minor
editing.
original commit: b8034828d0d3cbdc02216266ef7ea94e46d5e7a6
