[COMMENT] Fixed typo in comment.
[MODIF] Using WeakHashMap in Database.
[REFACTOR] Renamed creational into bare.
[REFACTOR] Renamed creational flag into bare.
[MODIF] Record by entry update is now classified as bare or not bare
depending on transaction change.
[FIX] Write "none" into database in case of null transaction values.
[MODIF] Do not use error-prone copy ctor of Entry.
[SUBMODULE] Update tests.