Fixes for problems spotted during verification of new tests from tests_api!121

[Fix] missing filtering for deleted posts lead to limit not being reached in some cases (get_ranked_posts)

[Fix] couple direct queries also supplemented with filter on deleted posts and some previously marked places changed to use sum of payout and pending_payout instead of just payout

[Fix] get_ranked_posts with payout/payout_comments sort now properly use tag value as category (renamed params and functions, functions corrected)

head_block_time() used where applicable

[Ign] tabs