Fixed format in valid_date utility routine

See merge request !214

Gathering mention fix

See merge request !185

issue 62: communities rank reworked

See merge request !205

Fixes related to bridge.get_ranked_posts

See merge request !203

[Fix] hive_votes_view now correctly takes reputation of voter instead of author (test patterns corrected)

Fixes related to reputations update during regular sync.

See merge request !206

Update of communities rank is executed in one query
Update is executed when sync is finished

[Ign] find_comment_id changed so it only ever looks for id when nonempty args are passed
[Fix] __post_id filled unconditionally (condition would fail to generate error if author was passed blank, but not permlink)
[Fix] everywhere where payout was needed sum of payout and pending_payout is used (this is true payout value for posts that are not paid yet)
[Fix] added ORDER BY id DESC (or changed to DESC) where it was missing (needed for paging to work correctly, also gives us correct order of newest first)
[Fix] pinned posts now subtract from limit as they used to in old version
[Fix] added missing LIMIT to bridge_get_ranked_post_by_payout_for_observer_communities and bridge_get_ranked_post_pinned_for_community (the latter is still missing paging, but that would change behaviour)
[Fix] added (and used) missing bridge_get_ranked_post_by_muted_for_observer_communities
[Fix] removed superfluous check from get_account_posts
[Change] promoted sort no longer only gives replies in results
[Change] sanity check: get_account_post_replies now requires given account to exist
marked some places where we most likely need to change use of payout into use of sum of payout and pending_payout
renamed bridge_get_ranked_post_by_trends_for_observer_community to bridge_get_ranked_post_by_trends_for_observer_communities to look like other of the same kind
duplicate bridge_get_ranked_post_by_hot_for_observer_communities removed
unused __head_block_time removed from ..._by_payout_comments... and bridge_get_ranked_post_by_muted
removed superfluous sort on created_at where it was still present (sort on id is enough)
tabs removed and indentation unified

Mi fix problem live sync

See merge request !200

Account reputations are calculated according to previously collected input data.

See merge request !182

Changes in the API implementations required to match reputation data calculated and held in the database now.

log virtual op calls

See merge request !197

Remove unexpected active auths spam from logs

See merge request !195

Added check preventing creation of already existing index.

See merge request !190

Index creation is forced only in case of massive sync. When sync is resumed...

See merge request !188

Index creation is forced only in case of massive sync. When sync is resumed for number of blocks less than LIMIT it shall be skipped and only really missing indexes shall be built.

Definition of update_hive_posts_children_count function changed to 'plpgsql'...

See merge request !186

rework bridge.get_ranked_posts

See merge request !183

Definition of update_hive_posts_children_count function changed to 'plpgsql' because of performance reasons.

get_ranked_post is completly reworked: instead
of assemby query in python sql methods are invoked

Gathering mentions

See merge request !178

Resolved conflicts:
   hive/db/db_state.py

account and permlink validators added to bridge API functions

See merge request !174