new tests mainly for get_discussions_by_author_before_date

See merge request !212

negative tests to cover new check on truncate_body in all calls that have it
new test to cover null limit bug in get_discussions_by_blog
some more additional tests

Tests matching hivemind branch with the same name

See merge request !211

[ABW]: pattern changed because recent changes in hivemind made observer ignored in get_account_posts

Merge branch 'abw_bridge_in_get_discussions_by_comments' of gitlab.syncad.com:hive/tests_api into abw_bridge_in_get_discussions_by_comments

[ABW]: added tests for bridge.get_account_posts comments and consenser_api.get_discussions_by_comments that share SQL function
supplemented tests for condenser_api.get_replies_by_last_update
some tests updated due to change in paging and unified checks

Changes in patterns required by hivemind!380

See merge request !210

Jsalyers blacklist updates

See merge request !208

update a blacklist string, restore a file with an accidental copy/paste

Tags_api readme files.

See merge request !153

[ABW]: _readme decriptions simplified since most of described routines are simple aliases to condenser_api
small corrections in existing _readme in condenser_api
merged with latest master

Follow_api readme files.

See merge request !151

[ABW]: _readme decriptions simplified since most of described routines are simple aliases to condenser_api
fixed placement of two _readme

Readme files for bridge api calls.

See merge request !150

database_api.find_comments 1000 pairs test

See merge request !200

Merge branch 'pmaniora_find_comments_1000_pairs' of gitlab.syncad.com:hive/tests_api into pmaniora_find_comments_1000_pairs

added test related to fix with encoding in find_comments
some community related negative tests changed after error check unification (also in some cases community is not validated where it wasn't before)
ignore_tags on admins removed since they are properly sorted by name
some tests are no longer failing due to addition of expected checks

Modifications of patterns because mock-reblogs were introduced

See merge request !201

Merge branch 'pmaniora_find_comments_1000_pairs' of gitlab.syncad.com:hive/tests_api into pmaniora_find_comments_1000_pairs

hivemind communities tests

See merge request !205

Observer related tests for get_ranked_posts

See merge request !206