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Refactor to be promise-based

This commit changes no functionality, except that a Promise is returned
by the read-package-tree function.  (A supplied callback is attached to
the returned promise if provided.)

Test coverage is brought up to 100%, and some code paths have been
slightly optimized, but the excessive level of realpath/lstat calls
remains for now.

23 of 23 branches covered (100.0%)

66 of 66 relevant lines covered (100.0%)

67.82 hits per line