This change was prompted by my discovery that under DrivePool, two
files can have the same dev, ino pair. It's understandable but the fact
of the matter is I don't want to rely on inodes any more.
Hashing has the downside of speed, but considering the time investment
of tagging files in the first place I think it should be worthwhile.
I want to reduce some complexity around here, part of which is that
launch imported entrypoint imported backend, all to do some proxy
wrapping which isn't necessary for the dev case anyway. Less
layers of wrapping and importing is good. Plus I think this naming
is more clear.
voussoir