Merge branch 'bw_db_upgrade_support2' into 'develop'

hive/db/db_state.py

hive/db/schema.py

hive/db/sql_scripts/db_upgrade.sh

hive/db/sql_scripts/hive_accounts_view.sql

hive/db/sql_scripts/notifications_view.sql

hive/db/sql_scripts/update_hive_posts_children_count.sql

hive/db/sql_scripts/update_posts_rshares.sql

hive/db/sql_scripts/upgrade/upgrade_runtime_migration.sql

hive/db/sql_scripts/upgrade/upgrade_table_schema.sql

hive/indexer/blocks.py