- removed insert and flush methods from FeedCache
- added batch insert operation for hive_feed_cache as SQL function:
  update_feed_cahe.sql
- simplified Reblog as it no longer requires calling FeedCache insert

Fixed performance of bridge_api.get_discussion

See merge request !152

[ABW]: tests rebound to newest master; also removed old CI group in bridge_api since all test are now separate

Various fixes in bridge and hive API

See merge request !147

[ABW]: tests rebound to version that has no more condenser_api tests in old scheme (with common .yaml)

[ABW]: last_month() moved to common to be shared across APIs (it should also be changed to take month from head block but it was not done yet)
changed checks on numerical values - now empty string is treated as if parameter was skipped; also invalid cast to int no longer generates Server Error, but 'invalid parameters'
[Fix] restored older version of list_top_communities, since most recent change was apparently experimental and introduced hardcoded community id into query; also fixed check on limit there
[Fix] fixed list_pop_communities; it was apparently never used since it crashed and its code did not change since inception
[Fix] added checks on min_score and post_id to post_notifications so they can generate meaningful errors (similar change should be done in account_notifications)
[Fix] post_notifications again reacts correctly on missing post specified in its call parameters (similar change needed in account_notifications for account param)
tabs removed from schema.py

Restoring indexes is always done

See merge request !144

Merge branch 'dk-uniform-insert-follow-reblog' of gitlab.syncad.com:hive/hivemind into dk-uniform-insert-follow-reblog

calculate hot and trends only for not paid posts

See merge request !141

one view for notifications

See merge request !140

adds table view for dynamic notifies
speeds up notifies queries
limits notifiaction only for 90 days before the head block

find_votes and list_votes fixes

See merge request !137

fixed bug introduced in previous MR - bridge_get_ranked_post_by_trends had random order within the same trend power, order by id was missing

faster bridge get trending for develop

See merge request !133

The call `get_accounts` is not supported by hivemind anymore

See merge request !118

vote related views/types/functions extended by id since database_api requires it
new SQL function to cover find_votes functionality
neither voter nor post is mandatory in list_votes calls
fixed internal _get_post_id in bridge_api
find_votes_impl no longer requires full context, just what it actually uses: db
find_votes_impl no longer checks passed arguments, only its official API version does
list_votes_impl removed, only its official version is needed
official API find_votes/list_votes now properly pack response in dictionary with 'votes' list

Load and execute sql script from file

See merge request !134

dynamically generated notifs

See merge request !123

The calls 'list_votes'/'find_votes' work

See merge request !129

Refactoring + `list_votes` sql function changed into `list_votes_by_voter_comment`/`list_votes_by_comment_voter`