Fix in accounts_by_name

See merge request !328

hive account info view optimization

See merge request !325

Follow refactor

See merge request !321

* accept all names from names list,
* if account name does not exists print warning message,
* not existing accounts are ignored.

* sql was never used in query_all,
* about field does not exists in hive_accounts

calculate trend and hot only for not paided posts

See merge request !326

[JES] jsalyers remove unused database fields

See merge request !289

Mi vote noitifcations payload speedup

See merge request !322

remove unused imports

See merge request !226

Issue #83 profile metadata not filled properly

See merge request !323

abs_rshares and rshares are saved now in hive_posts table and no
longer computed dynamically from votes. It speeds up notifactions query
c.a. 70%.

In case of post it is better to first filter against
author/parent_author instead of blocks

list comments_by_permlink performance improvements

See merge request !318