make LogTransport work with custom implementations of PSR LoggerInterface
Remove last duplicate unset
Extract file validation method
Query grammar should not explode segments on alias
fix memory leak in QueryBuilder/JoinBuilder
Merge pull request #5837 from bishopb/4.2

Query grammar should not explode segments on alias
Merge pull request #5825 from joegreen0991/db-memory-leak-fix

Db memory leak fix #5568
Merge pull request #5818 from lucasmichot/4.2-request-isvalidfile

[4.2] Request : extract file validation method
Merge pull request #5817 from lucasmichot/4.2-duplicate-unset

[4.2] Database : remove last duplicate unset
Merge pull request #5816 from alprs/fix/flexible-logtransport

[4.2] Make LogTransport work with custom implementations of PSR LoggerInterface
Adding note.
Fixing conflicts.