Add node_access API compatibility

Issue Summary

Hello,
Similar seems not to be working with node_acess API. In function _similar_content() I need to add db_rewrite_sql(). Just replace

$result = db_query_range('SELECT n.nid, n.title , match(n.body, n.title) AGAINST ("%s") AS score FROM {node} n WHERE MATCH(n.body, n.title) AGAINST ("%s") AND n.nid <> %d ORDER BY score DESC', $text, $text, $similar_node_nid, 0, 5);

with

$result = db_query_range(db_rewrite_sql('SELECT n.nid, n.title , match(n.body, n.title) AGAINST ("%s") AS score FROM {node} n WHERE MATCH(n.body, n.title) AGAINST ("%s") AND n.nid <> %d ORDER BY score DESC'), $text, $text, $similar_node_nid, 0, 5);.

Hope, this help.
eric