Alm-solrindex

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- The Solr URI can now be provided by an environment variable,
so that catalog.xml does not need to hard code the URI.

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- Added narrative documentation.

- Don't clear the index when running GenericSetup. Clearing
indexes turns out to be a long-standing problem with GenericSetup;
in this case the easy solution is to just not clear it.

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- Added a script that waits for Solr to start up.

- Brought in a private copy of solrpy to fix some bugs:

- The connection retry code reconnected, but wasn't
actually retrying the request.

- The raw_query method should not assume the parameter
values are unicode (they could be lists of unicode).

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- Purge Solr when importing a SolrIndex via GenericSetup.

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- Made field handlers more flexible. Now they can add any
kind of query parameter to the Solr query.

- The default field handler now generates "fq" parameters
instead of "q" parameters. This seems to fit the intent of
the Solr authors much better.

- Renamed "solr_additional" to "solr_params".

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- Added a GenericSetup profile that replaces SearchableText
with a SolrIndex.

- Renamed the catalog parameter for passing extra args to Solr
"solr_additional". Also renamed the response callback
parameter to "solr_callback".