(ITS#8181) LMDB page leaks etc when treating DBs as data

[h.b.furuseth@usit.uio.no]

Full_Name: Hallvard B Furuseth
Version: LMDB_0.9.15
OS: 
URL: 
Submission from: (NULL) (81.191.45.5)
Submitted by: hallvard


The user can overwrite or delete a named DB record
with normal data.  This leaks the pages of the DB.
Also the new non-DB can then be treated as a DB.
A fix is coming (from my branch mdb/bundle).