return early if the posting list had only one entry
dcs-package-importer: link in pprof over HTTP for debugging
ignore libtool.m4 directory (!), turns out some packages have that
move package indexing to a separate function, copy files to *unpackedPath

Factoring this out of the infinite loop seems to make the garbage
collector work better, perhaps due to objects properly going out of
scope? Definitely seems like a bug, but without this change, the
importer would OOM.