Library Version 12.1.6.0

Read Only flag for DBT
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## Read Only flag for DBT

A DBT can now be set as read-only, when passed to the DB->get() method, using the flag `DB_DBT_READONLY`. This is useful when using a static string as a key value, because this flag will prevent Berkeley DB from updating the DBT.

### New Flag

- `DB_DBT_READONLY`

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