Revert ITS#7789 commits, let's try this again.

Revert "ITS#7789 Fix resize vs MDB_NOMETASYNC, and a comment."
Revert "ITS#7789 more"
Revert "Revert "ITS#7789 update RESIZED errmsg text""
Revert "ITS#7789 update RESIZED errmsg text"
Revert "ITS#7789 persist mapsize changes"

This reverts commit 02285aca.
This reverts commit 38e71c68.
This reverts commit a5e4eecb.
This reverts commit d8e18551.
This reverts commit 5926e54b.