Add preferred_block_size_bytes for non-uniform reader. [#CLICKHOUSE-2902]

Make enums test more deterministic. [#CLICKHOUSE-2]

Refactored MergeTree readers.

Tabs -> spaces.

Move include/DB/ -> src/.

* Allow use external re2 with re2_st=re2

* fix

* remove dupe

* use re2_st in FunctionsStringSearch.h

* fix

* move files from tools/etc to debian

* dont generate control

* version

* ok.

* wip

* Cmake: dont touch CMAKE_INSTALL_PREFIX

* wip

* works!

* clean

* okay

* like old

* wip

* wip

* okay

* clickhouse-server-base-dbg

* clean

* clickhouse-server-dbg

* Debian: Remove daemons

* Update rules

* add source/format

* control clean

* add watch

* clean

* clean

* temp fix build

* clean

* docs

* fake make_control

* fix

* testme

* testme

* add metrika package

* fake metrika files

* ReplicatedMergeTree: Max streams to send data [#CLICKHOUSE-2878]

* fix

* better messages on client

* change code to 429 TOO_MANY_REQUESTS

* wip

* better message

* Update InterserverIOHandler.h

* Update InterserverIOHTTPHandler.cpp

* Update StorageReplicatedMergeTree.cpp

Added 'join_use_nulls' setting to allow using NULLs as default values for non-joined rows in case of outer joins [#CLICKHOUSE-2].

This reverts commit abaa1501.

This reverts commit 431a735e.

Removed all trailing whitespaces [#CLICKHOUSE-2]. find . -name '*.h' -or -name '*.cpp' -or -name '*.cmake' -or -name 'CMakeLists.txt' -or -name '*.html' -or -name '*.xml' | grep -v contrib | xargs sed -i -r -e 's/\s+$//'

* Max parallel fetches limit

* use MergeTreeSettings.h

* clean

* Add REMOVE_PART

* fix

* fix

* fix codestyle

* allow several <graphite> targets

* fix

* fix

* Adjustable parts

* changelog version

* fix

* changelog

* Style fixes

* attachSystemTables

* config describe

* fixes

* fixes