Small fixes in bridge_api, basic fixes in database_api

Andrzej Lisakrequested to merge
database_api_fixes1 into develop

[Fix] fixed payouts in bridge_api (still there are differences but they are in DB data, not in how the data is presented)

[Fix] fixed discussion tree building and ordering in bridge_api

[Fix] children needs to be INT in database_api_post

[Fix] fixed condition in database_api::list_comments_by_permlink

[WIP] marked deviations from original fat node behaviour in various database_api::list_comments_by_... functions and in list_votes

[Fix] response from database_api calls is properly a dictionary with array instead of raw array

[Fix] fixed database_api::find_comments arguments and how the query is built (single query with JOIN instead of list of separate same queries with UNION ALL)

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