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This reverts commit 47c4e747.

Revert "ITS#8117 fix INTEGERDUP compare"

This reverts commit ba45e0c0.

Fix mdb_txn_begin(&read-only txn) calls. Test mdb_env_set_maxreaders().
Rename DBI open/close functions. Move mdb_dbi_close() out of txn.

(Probably fixes the ITS, definitely fixes a bug) when collapsing
the root page, fixups of other cursors was incomplete.

Copied from 58ddb552.

Leonid Yuriev authored Oct 17, 2014 and Hallvard Furuseth committed Jan 14, 2015

Inconsistent reading & SIGSEGV due to the race condition.

Leonid Yuriev authored Oct 17, 2014 and Hallvard Furuseth committed Jan 14, 2015

Globally shared fields of meta-data were not 'volatile'.
Code from 9a80a8a8,
except the unportable __synchronize().

Check for ext3/ext4 fs, then check kernel version.

This reverts commit e95c9231.

Revert "Hack for potential ext3/ext4 corruption issue"

This reverts commit 91155b9d.

Use regular fsync() if we think this commit grew the DB file.

We actually compare the new key against the last key, to prevent
corruption.

The concurrency restriction is on threads within a single process.
Multiple processes can use mdb_dbi_open without affecting each other.