Turning the NODE_DEBUG=module trace off for EVERYTHING alone was not
enough: a dev build from the build.sh menu wrote 1.1 GB, three million
lines, in its first three minutes, before it was interrupted. The trace
is now opt-in in build.sh and build.bat alike, and the diagnostics line
says whether it is on and how to turn it on. The other build diagnostics
(resolver commands, npm verbose, METEOR_PROFILE) are unchanged.
Thanks to xet7 !