* Update of english version of descriprion of the table function `file`.

* New syntax for ReplacingMergeTree.
Some improvements in text.

* Significantly change article about SummingMergeTree.
Article is restructured, text is changed in many places of the document. New syntax for table creation is described.

* Descriptions of AggregateFunction and AggregatingMergeTree are updated. Russian version.

* New syntax for new syntax of CREATE TABLE

* Added english docs on Aggregating, Replacing and SummingMergeTree.

* CollapsingMergeTree docs. English version.

* 1. Update of CollapsingMergeTree. 2. Minor changes in markup

* Update aggregatefunction.md

* Update aggregatefunction.md

* Update aggregatefunction.md

* Update aggregatingmergetree.md

* GraphiteMergeTree docs update.
New syntax for creation of Replicated* tables.
Minor changes in *MergeTree tables creation syntax.

* Markup fix

* Markup and language fixes

* Clarification in the CollapsingMergeTree article

* DOCAPI-4821. Sync between ru and en versions of docs.

* Fixed the ambiguity in geo functions description.

* Example of JOIN in ru docs

* Deleted misinforming example.

* Fixed links to IN operators.

* Updated the description of ALTER MODIFY.

* [RU] Updated ALTER MODIFY description.

* DOCAPI-4479. English changes are translated into russian.

* DOCAPI-4479. Minor text and markup fixes.

* DOCAPI-4479. Minor text edits.

Move copy_headers.sh and formath.sh from root.
Debian: use default build dir (obj-x86_64-linux-gnu)
Debian: add test after build (GLIBC_required_version)
cmake: dont run copy headers if already copied

Added recommended package for clickhouse-server

Add doc for per-column compression codecs

child free ASTIdentifier

CLICKHOUSE-4257 remoteSecure

Fix typos

Compact storage of the part header in ZooKeeper

Better test images (with ts in output)

Some more ASTIdentifier refactoring

Add env variables systemwide

MultiVolnitsky added with tests and some benchmark, many multiFunctions are added to support multistring search