newevents all tested, with working string queries including magic
- Throw out reference tracking stuff; just too complicated and poorly
  supported by capture formats to bother with for now.
- Add ability to transform recorded data on the way in (for simple
  replacement for above).
- Switch magic event attribute names to start with underscore
  (e.g. _RECORDING instead of RECORDING).
more reworking of newevents and newdata; tests pass
parallel map checkpoint -- works
checkpoint
rename upimap to parimap to avoid confusion with picloud
remove partially thought through cloud-package-based pickle code
code for doing rERPs, in principle at least
rerp code runs without crashing