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Features:
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* Add `CONCAT` to SQLCompleter and remove unused code (Thanks: [caitinggui])
* Do not quit when aborting a confirmation prompt (Thanks: [Thomas Roten]).
* Add option list-dsn (Thanks: [Frederic Aoustin]).
* Add verbose option for list-dsn, add tests and clean up code (Thanks: [Dick Marinus]).
Bug Fixes:
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* Add enable_pager to the config file (Thanks: [Frederic Aoustin]).
* Mark `test_sql_output` as a dbtest (Thanks: [Dick Marinus]).
* Don't crash if the log/history file directories don't exist (Thanks: [Thomas Roten]).
* Unquote dsn username and password (Thanks: [Dick Marinus]).
* Output `Password:` prompt to stderr (Thanks: [ushuz]).
* Mark `alter` as a destructive query (Thanks: [Dick Marinus]).
* Quote CSV fields (Thanks: [Thomas Roten]).
* Fix `thanks_picker` (Thanks: [Dick Marinus]).
Internal:
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* Refactor Destructive Warning behave tests (Thanks: [Dick Marinus]).