Revert "jlab3 and restore to working form"

[telamonian]

Reverts #85. #85 was originally pulled in without discussion or review, which it very much requires. #85 is at least 2 separate PRs:

• the jlab3 upgrade
• a whole bunch of code style and dev env tweaks

Problems:

• jlab3 and restore to working form #85 was not discussed or reviewed
• mixing major code autoformat tweaks and the jlab3 upgrade is a Bad Idea. Aside from totally obfuscating the upgrade code, this approach guarantees that any backports will be as painful to create as humanly possible
• we already have perfectly acceptable python autoformatting. I do not want black
• the top-level package.json should remain where it is

[timkpaine]

discussed offline, moving into #97 for changes