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/**
 * Search a module DataStore and return matching items
 *
 * $_params is an array that contains all the function parameters - i.e.:
 *
 * <code>
 * $_params = array(
 *     'search' => array(
 *         'user_name = brian',
 *         'user_height > 72'
 *     ),
 *     'order_by' => array(
 *         'user_name' => 'asc',
 *         'user_height' => 'desc'
 *     ),
 *     'group_by' => '_user_id',
 *     'return_keys' => array(
 *         'user_email',
 *         'username'
 *      ),
 *     'return_count' => true|false,
 *     'limit' => 50
 * );
 *
 * wildcard searches use a % in the key name:
 * 'search' => array(
 *     'user_% = brian',
 *     '% like brian%'
 * );
 * </code>
 *
 * "no_cache" - by default search results are cached - this will disable caching if set to true
 *
 * "cache_seconds" - set length of time result set is cached
 *
 * "return_keys" - only return the matching keys
 *
 * "return_count" - If the "return_count" parameter is set to TRUE, then only the COUNT of matching
 * entries will be returned.
 *
 * "privacy_check" - by default only items that are viewable to the calling user will be returned -
 * set "privacy_check" to FALSE to disable privacy settings checking.
 *
 * "ignore_pending" - by default only items that are NOT pending are shown - set ignore_pending to
 * TRUE to skip the pending item check
 *
 * "exclude_(module)_keys" - some modules (such as jrUser and jrProfile) add extra keys into the returned
 * results - you can skip adding these extra keys in by disable the module(s) you do not want keys for.
 *
 * Valid Search conditions are:
 * <code>
 *  =        - "equals"
 *  !=       - "not equals"
 *  >        - greater than
 *  >=       - greater than or equal to
 *  <        - less than
 *  <=       - less than or equal to
 *  like     - wildcard text search - i.e. "user_name like %ob%" would find "robert" and "bob". % is wildcard character.
 *  not_like - wildcard text negated search - same format as "like"
 *  in       - "in list" of values - i.e. "user_name in brian,douglas,paul,michael" would find all 4 matches
 *  not_in   - negated "in least" search - same format as "in"
 * </code>
 * @param string $module Module the DataStore belongs to
 * @param array $_params Search Parameters
 * @return mixed Array on success, Bool on error
 */
function jrCore_db_search_items($module, $_params)