"df -T" output:

Before:

  Filesystem                 Type                   1K-blocks      Used  Available Use% Mounted on
  pathfs.pathInode           fuse.pathfs.pathInode    4015252   3219628     795624  81% /tmp/mountpoint

After:

  Filesystem                 Type             1K-blocks      Used  Available Use% Mounted on
  /tmp/original              fuse.loopbackfs    4015252   3219620     795632  81% /tmp/mountpoint

EINTR is commonly encountered when running under a debugger, so this
change makes it possible to do so without hitting spurious
EINTR errors.

Fixes #39.

This makes automated import rewriting more robust.

The code confuses the race-detector, and the work-arounds to fool the
race-detector fools humans. No conclusive benchmark data supports
the usefulness of the handle maps.

This is necessary to work around apparent bugs in the OSX FUSE
implementation.

OSXFUSE requires STATFS to always be present.

This protects against deadlock should the kernel issue a lookup
synchronously in response. This behavior has been seen on Linux
3.15.3-200.fc20.x86_64.