Merge stable-1.10 into master

basic_string: add constructor with view parameter

- test string_view cons
- test new template operator=

- add constructor that implicitly converts parameter to view string
- add template assignment operator for basic_string

It causes parsing error and it is not required to
have detail class documented.

Adjust radix_tree to template inline_string as key

Merge stable-1.9 into stable-1.10

Merge stable-1.8 into stable-1.9

new overloads return non const iterator

Merge stable 1.7 into stable 1.8

concurrent_map: implement lower and lower_eq methods

Merge stable-1.6 into stable-1.7

Add missing packages in CentOS

docker: make build- and push-image scripts more verbose

docker: fix directory name used in run-doc-update.sh

Merge stable-1.5 into stable-1.6

doc: fix doxygen comments for string_view

otherwise it will still use found (most likely, newer) clang-format.