enable thresholded field compression for certain field types 
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                 Key: SOLR-45
                 URL: http://issues.apache.org/jira/browse/SOLR-45
             Project: Solr
          Issue Type: New Feature
          Components: update
            Reporter: Mike Klaas
         Assigned To: Mike Klaas
            Priority: Minor
         Attachments: compress_patch.diff

Adds a CompressableField abstract base class from which fieldtypes may inherit. 
 Fields of these types may specify compressed="true" in the field definition to 
turn on compression.  The field type takes an optional compressThreshold 
parameter which will only turn on compression for fields whose internal 
representations of greater or equal to a given size.

TextField and StrField inherit from CompressableField

Comments? (my main issue is that it woudl be nice to be able to set 
compressThreshold at the field level.  Since we can't without modifying fields 
to accept named parameters, perhaps it would be preferrable to only allow 
compress=true/false to be set at the fieldtype leve)

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