Attempt to make performance test more reliable

Binary operator monotonicity

Enable more tests with Atomic database

Update default build to gcc-10

Improve Chinese translation of remote.md

Update clickhouse-benchmark.md

Fix access denied on opening file /var/lib/clickhouse/status in integration tests.

changelog for 20.8

Fix signedness conversion monotonicity

Experiment. Allow to turn on fsync on inserts, merges and fetches.

Do less runs in perf test

Add the section <user_directories> to the default config.

column transformers in insert select

Pass -fsanitize-blacklist for TSAN only under clang (gcc does not support this)

utils/list-licenses/list-licenses.sh: ignore more files