[Solr Wiki] Update of "DataImportHandler" by NoblePaul

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The following page has been changed by NoblePaul:
http://wiki.apache.org/solr/DataImportHandler

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   * '''`pk`''' : The primary key for the entity. It is '''optional''' and only needed when using delta-imports. It has no relation to the uniqueKey defined in schema.xml but they both can be the same.
   * '''`rootEntity`''' : By default the entities falling under the document are root entities. If it is set to false , the entity directly falling under that entity will be treated as the root entity (so on and so forth). For every row returned by the root entity a document is created in Solr
   * '''`onError`''' : (abort|skip|continue) . The default value is 'abort' . 'skip' skips the current document. 'continue' continues as if the error did not happen . <!> ["Solr1.4"]
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+  * '''`preImportDeleteQuery`''' : before full-import this will be used to cleanup the index instead of using '*:*' <!> ["Solr1.4"].
+  * '''`postImportDeleteQuery`''' : after full-import this will be used to cleanup the index <!> ["Solr1.4"].
  For !SqlEntityProcessor the entity attributes are :
  
   * '''`query`''' (required) : The sql string using which to query the db