Add the hability to recomend configuration changes on Solr

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With all the information solrmeter gathers from Solr configuration and 
statistics, SolrMeter could recomend the user to perform changes on Solr 
configuration.
For example, if autowarm is taking too long and commits are performed in a 
relatively short interval, SolrMeter could recomend to low the autowarm time by 
putting lower values on "autowarm" attributes of cache configuration.
There could be many of this kind of rules and they could be implemented with 
some business rule management system like drools.

Original issue reported on code.google.com by [email protected] on 26 Jul 2010 at 5:56