Escape characters in user names provided in follow_op

See merge request !346

Run tests is now using tox environments

See merge request !350

* Reverted hardcoded block number and changed to use CI var HIVEMIND_MAX_BLOCK.
* Please add a possibility to set HIVEMIND_MAX_BLOCK.
* operation_extractor:
** name of parameter `hivemind_address` changed to `hived_url` as we
   scan blocks from `hived`
** added description to the script

Moved mock block data to last blocks of sync to avoid id changes in some tests. Fixed get_state tests with head block and head time from mock data.

get_number_of_unread_notifications speedup

See merge request !348

API tests execution time reports

See merge request !246

Conflicts:
	tests/tests_api

Simplification of `bridge_get_ranked_post*` family SQL methods

See merge request !329

Further simplifications regarding `get_pids*` methods

See merge request !339

Conflicts resolved:
	hive/server/condenser_api/get_state.py
	tests/tests_api

Refactoring of the SQL method `get_state`

See merge request !345

Mock data providers

See merge request !336

Mi slow get ranked post

See merge request !344

Workaround with 'id + 0'  which previously speed up the query
after some time fails and has to be removed because it slow down
get_ranked_post.