Handle negative filters and improve date facet block code

We are passing these fields in as filter queries - in contrast to previously as the q param. I think this will not work for the current query class because we look for field names like so:

    // Gets information about the fields already in solr index.
    $index_fields = $this->solr->getFields();

    $rows = array();
    foreach ((array) $index_fields as $name => $field) {
      do {
        // save the strlen so we can detect if it has changed at the bottom
        // of the do loop
        $a = (int)strlen($filters);
        // Get the values for $name
        $values = Solr_Base_Query::query_extract($filters, $name);

The $name will never have a leading - and hence will never be matched.

we could correctly handle negative filters with something like the change attached.

plus a start at handling these facets if they exist.

reroll for views patch

Further cleanup for facet code and date facet code.

committed to 6.x