Major Description
In trying to implement http://wiki.apache.org/solr/HierarchicalFaceting I found the need to send multiple prefix facets in the same request on the same field.
Currently facet params will parse the localParams, but only use them to pick out a name. We can easily modify things to let localParams override global ones. For example:
&{!key=level3 facet.prefix=3/path/to/folder}path
&{!key=level2 facet.prefix=2/path/to}path
&{!key=level1 facet.prefix=1/path}path
This can easily be supported if we use:
params = SolrParams.wrapDefaults(localParams, orig);
when local params exist
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We have come a long way from simple facets!
