Clean up this script a bit:

* Don't require the script to be called from inside the branch directory;
  follow standard practise and pass the branch to build as an argument.
* Populate the chroot with the BSD.local.dist mtree file
* Add whitespace for readability, and sprinkle liberally with comments
* Comment on some inscrutable parts of the script which were presumably
  put there to work around a (perceived) problem, but which I can't
  understand.

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