Imported from https://github.com/llvm-mirror/libcxx/commit/88f5d7a38bf379d2772a7c0b064b680d6eaea4dc

Update clang format

Add aggregate initialization support

which fixes unused variable warning in release build.

Warnings cleanup

On windows Wall contains all possible warnings (most of which is either
generated by windows headers or too pedantic - e.g. padding added by compiler)

and remove comment regarding clang-format (only 3.8 and 3.9 is supported)

to avoid -Wformat-security

common: update docker images

common: set codecov threshold to 0.2

common: fix cmake variable name in readme

tests: better message while skipping tests

doc: fix reference to v snippet

Add PMEMOBJ++Config.cmake and build standalone examples

and some cleanup

doc: add link to v template

common: deal with dot files

examples: add standalone CMakeLists

common: auto doc update

common: fix finding libpmemobj