replace levelDb with SQLite for Vault
consistent db_path (always file_name)
connect to database each time
removing leveldb
style correction
switch back to open database connection only once; call checkpoin after every certain amount of write operations(Put or Delete)
Merge branch 'next' into MAID-10_replace_leveldb_with_sqlite
Create mpid_messaging.md
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Merge remote-tracking branch 'upstream/next' into MAID-278_fix
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