Change 21839

C. Thomas Tyler v2.8.23:
* Added exlusions to 'preserve dirs' feature to avoid copying
  DVCS repo files.
* Reduced excessive noise losing the '-v' flag for tarfile extraction.
* Enhanced to use 'curl' rather than 'wget', as it is functionally
  equivalent for our purposes, and is more ubiquituous. v1.4.7:
* Enhanced environment isolation.
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