add option query.ingoreAccessRestrictions

* lets us use an index without the special query parser
** also with Solr 4
* lets us query non-TYPO3 indices without the siteHash and endtime fields
* add function for adding the access restriction query parts which is called for both main queries and suggestions
tx_solr_SolrService→__toString: add missing colon
stricter comparison of solr→ping result