Some static features are in the query-document feature set

[lgrz]

Move the following features into the static document feature set since they can all be precomputed and don't depend on the query (note that url slash count and url length are already there, but they need to be removed from doc_entry and friends):

    // The number of times the <title> tag appears in the document
    int tag_title_count = 0;
    // The number of times the <heading> tag appears in the document
    int tag_heading_count = 0; // Indri heading field includes tags h1-h4
    // The number of inlinks in the document
    int tag_inlink_count = 0;
    // The number of times the <applet> tag appears in the document
    int tag_applet_count = 0;
    // The number of times the <object> tag appears in the document
    int tag_object_count = 0;
    // The number of times the <embed> tag appears in the document
    int tag_embed_count = 0;

    // Number of slashes in URL
    int url_slash_count = 0;
    // URL length
    size_t url_length = 0;

[lgrz]

To add to this, f_url_slash_count is output via the config.ini according to the documentation, but f_url_length was omitted. So if one is using a config copied from the documentation you will see this behaviour.