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and enforce exclusive access to environment. Also fix txn_begin/pick_meta
to use correct meta page, and reset the flag after successful commit.

Drop macro Y=MDB_FMT_Y, add Yu/Yd=MDB_PRIy(). Replace
Y"d..." -> Yd"...", Y"u..." -> Yu"..." / MDB_SCNy(u)"...".

Use 64 bit types consistently. This keeps database structures the
same size for MDB_VL32 and native 64 bit builds.

Don't obtain reader txn before displaying reader table. Exit
after reader table if no other DB query options were given.

Dump the active slots in the reader table.

Exit with success when there was no failure.
Do not use data containing NUL as a DB name (which is a C string).

MDB_NEXT_NODUP, MDB_PREV_NODUP: Allow for non-MDB_DUPSORT databases.
No mdb.c code changes needed.

mdb_stat.c: Use MDB_NEXT_NODUP, to avoid a crash with a DUPSORT mainDB.

Avoid naming conflicts with other mdb* packages. Bump version to 0.9.5

Use explicit MDB_RDONLY flag

mdb_close() takes an env, not a txn.
Also, add check for stale DB records (in case some other process
wrote to the DB last).

Note derived from Martin Hedenfalk's btree.c; the code
is significantly reworked but owes a lot to the original.