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_follows.sql

+DROP FUNCTION IF EXISTS condenser_get_follow_count;
+CREATE FUNCTION condenser_get_follow_count( in _account VARCHAR,
+  out following hive_accounts.following%TYPE, out followers hive_accounts.followers%TYPE )
+AS
+$function$
+DECLARE
+  __account_id INT;
+BEGIN
+  __account_id = find_account_id( _account, True );
+  SELECT ha.following, ha.followers INTO following, followers FROM hive_accounts ha WHERE ha.id = __account_id;
+  -- following equals (SELECT COUNT(*) FROM hive_follows WHERE state = 1 AND following = __account_id)
+  -- followers equals (SELECT COUNT(*) FROM hive_follows WHERE state = 1 AND follower  = __account_id)
+END
+$function$
+language plpgsql STABLE;