From Roman Neuhauser: Rework textual options handling.

   * New functions archive_{read,write}_set_{format,filter}_option accept
     three strings: module name, option name, value.
     This is a better match for C clients of the library, who want
     to set one option at a time anyway for better error handling.
   * archive_{read,write}_set_options still accept a single string
     with possibly multiple options, but are now much simpler internally
     because they build on the above.
   * New tests for all of the above.
   * Update a lot of tests to give good coverage of the new functions.

SVN-Revision: 3026

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