* adding batch entry
* add batched put and delete
* add batched tests
* adding batching capabilities to remaining stores
* open db in readonly mode
* make naming consistent
* release prepared statements
* don't use deprecated add
* check file exists on test exit
* remove unused var
* add basic query capabilities to fsds
* rename common tests
* make query tests common
* sanitize key
* check it's possible to query keys at same level
