* Try fix freebsd 11-STABLE OCbuild

* Fix freebsd and macos build (contrib/libbtrie)

CLICKHOUSE-2720: some progress on website

Pretty simple addition to allow generating debian packages with the git
hash as part of the packages name. This may be useful for a nightly
build style for fast testing

	Description of distributed_product_mode was added.

2. Merge remote-tracking branch 'upstream/master'.

Desctiption of settings application is actualized.

repo management.

This commit implements a basic IP prefix dictionary
that allows storing IPv4/IPv6 prefixes and
matching them against a single IP address on query
time. This allows for doing IP -> ASN matching and
other similar things on query time.

The implementation is basic for start, using a
simple bitwise trie and reusing interface for
complex key dictionaries (so using tuple instead
of UInt32/FixedString(16) as the key). A faster
bitwise trie implementation (like poptrie) is
desired to improve lookup performance and
memory consumption with large prefix tables.

By default start with 2^4 elements

this fixes build on Debian