The `curation_reward_operation` is removed, because `author_reward_operation` hold information about curators payments

Some fixes related to get_state as well as vote handling

See merge request !60

Mt votes fixes

See merge request !59

[ABW]: [Fix] exit_after_sync switch only handled after chain state was updated (part of get_state fix)
[Fix] get_feed_history now called directly from database_api (part of get_state fix)
[Note] unfortunately data that get_state uses requires node with condenser_api and market_history
[Fix] corrected conflict handling during hive_votes update (copied from MT branch)
id renamed voter_id in hive_votes_accounts_permlinks_view to prevent confusion with hive_vote.id
couple more uses of hive_votes_accounts_permlinks_view (most likely in not yet unused code though)
minor rebranding for get_state result

Removed rshares column from hive_posts and corrected places that used it

See merge request !56

hive_votes_accounts_permlinks_view used in one more place instead of hive_votes (most likely unused since query was totally broken)

[ABW]: [Fix] removed unused rshares field from hive_posts (it is calculated dynamically in hive_posts_view)
[Fix] more uses for hive_posts_view (needed to make sure all uses of rshares go through view)
[Fix] rshares in hive_posts_view now properly has value 0 when there is no votes
[Fix] there is no such thing as is_invalid in hive_posts (fixed to is_valid)
[Fix] removed some unused class and routines (two whole files and some more)
[Ign] some formatting changes

issue #25 get discussion by promoted returns wrong post

See merge request !55

get_discussion SQL query fixes

See merge request !53

Net rshares fix

See merge request !54

- Added author_id to hive_posts_view,
- Removed inner join on hive_accounts in get_discussions sql query

[Fix] condenser_api::get_content_replies uses short active_votes form