reusing code of bridge calls in condenser_api

[Fix] get_account_reputations checks type of account_lower_bound parameter; also added default for limit (1000 - the same as it was in fat node)

[Fix] get_discussions_by_promoted reuse bridge_get_ranked_post_by_promoted* SQL functions (means code reuse + fix for paging and performance)

[Fix] get_post_discussions_by_payout reuse bridge_get_ranked_post_by_payout* SQL functions (means code reuse + fix for paging and performance); that required extra parameter to be able to turn off payout interval filter

[Fix] get_comment_discussions_by_payout reuse bridge_get_ranked_post_by_payout_comments* SQL functions (means code reuse + fix for paging and performance)

Old SQL implementations of above condenser_api calls removed.

[Fix] restored missing vote muting code in all above and more condenser_api calls

hive/db/sql_scripts/condenser_get_follow_counts.sql

-DROP FUNCTION IF EXISTS condenser_get_follow_counts;
-
-CREATE FUNCTION condenser_get_follow_counts( in _account VARCHAR )
-RETURNS TABLE(
-    following hive_accounts.following%TYPE,
-    followers hive_accounts.followers%TYPE
-)
-AS
-$function$
-DECLARE
-BEGIN
-
-  RETURN QUERY SELECT
-    ha.following, ha.followers
-    FROM hive_accounts ha
-    WHERE ha.name = _account;
-
-END
-$function$
-language plpgsql STABLE;