* More precise overflow check in readIntTextImpl
* writeDateTimeText now always writes sub-second part for DateTime64
* comment for validateFunctionArgumentTypes
* DateTime64-related fixes for FunctionConvertFromString
* other minoe fixes: comments, removed commented out code, variable
  renamings, etc.

* put functions in DecimalFunctions into DecimalUtils namespace
* fixed possible buffer overflow in parseDateTimeBestEffortImpl
* fixed readDateTimeTextImpl not to require fractional part separator
  (if fractional part is missing)
* Tests for code from DecimalFunctions.h
* Fixed serializing DateTime64 to string with writeDateTimeText(), fixed tests

Separated pool for background moves

zh/docs for development parts..

Merge pull request #7936 from ClickHouse/branch-for-slightly-improvement-of-usability-of-exception-messages

The rest of PR #7897 about improvement of exception message

Typo in docs

tuble > tuple

Doc change. Fix for  alter_attach-partition. English version.

Update CHANGELOG.md setting 'any_join_get_any_from_right_table' -> 'any_join_distinct_right_table_keys'

There is no such setting, real parameter name is 'any_join_distinct_right_table_keys' (from exception message)

Fix for alter attach alter_attach-partition (fixes #5312). English version.

Doc change. OPTIMIZE DEDUPLICATE description

Update alter.md

fix cli docs

old kernel hdfs support

Removed check for using `Date` or `DateTime` column from TTL expressions

DirectoryMonitor: mark batch as broken on UNKNOWN_CODEC/CANNOT_DECOMPRESS errors

fix utf-8 paste

There is no point in retrying batch after those errors (for the same
reasons as CHECKSUM_DOESNT_MATCH is there).