contrib/archive/README.txt needs clarifications

When following the contrib/archive/README.txt, I went down a few blind alleys because of some ambiguities in the text. The next person reading it would be greatly helped if the following doc changes were made:

• Point to a local copy of the comprehensive, in-depth Getting Started

  • Where is the source of this page: http://archive-access.sourceforge.net/projects/nutchwax/apidocs/overview-summary.html

• State that the "simple" directions in the README.txt are for non-distributed, Standalone mode

  • tell how to get into this mode and what it means

  • alternatively, turn the overview-summary.html into a real getting started and use that to replace the current README.txt

• In real distributed mode, "nutchwax import" only handles obtaining arc files from S3 or via http, and not hdfs

  • no import via hdfs:// was a surprise since full interoperation is naturally assumed, so this current limitation should be pointed out.

  • Import of arc files from the real fs is possible, but on a distributed hadoop, the local files must be replicated to each slave machine (very inefficient, but this could be a convenient first test to see if an old arc file can be processed).