Use merge commits for atime tests + cleanup (#7701)

* merge-commit

* merge-commit

* pr5427

* fread and 0.5

* shallow expr down

* memrecycle

* comma

* expr dowm

* merge

* isoweek

* doc commit source

* fread

* expr last

* regression PR instead of parent of fix

Co-authored-by: aitap <krylov.r00t@gmail.com>

* merge commit PR6393 instead of close to last

Co-authored-by: aitap <krylov.r00t@gmail.com>

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Co-authored-by: Toby Dylan Hocking <toby.dylan.hocking@usherbrooke.ca>
Co-authored-by: aitap <krylov.r00t@gmail.com>

Author: 3 people