Overhaul of 'ar' support:

  * use "AR_GNU" as the format name instead of AR_SVR4 (it's what everyone is going to call it anyway)
  * Simplify numeric parsing to unsigned (none of the numeric values should ever be negative); don't run off end of numeric fields.
  * Finish parsing the common header fields before the next I/O request (which might dump the contents)
  * Be smarter about format guessing and trimming filenames.
  * Most of the magic values are only used in one place, so just inline them.
  * Many more comments.
  * Be smarter about handling damaged entries; return something reasonable.
  * Call it a "filename table" instead of a "string table"
  * Update tests.

Enable selection of 'ar', 'arbsd', and 'argnu' formats by name
(this allows bsdtar to create ar format archives).

The 'ar' writer still needs some work; it should reject
entries that aren't regular files and should probably also
strip leading paths from filenames.

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