Add container of operations on packages by their NEVRAs.
Remove unneeded sack parameter from open_history.
Return history of a transaction in the new container.
refactor: Rename functions in Base.history_undo.
refactor: Move obsoleted packages handling within Base.history_undo.
refactor: Move the content of HistoryCommand._hcmd_undo to BaseCli.history_undo_transaction.
refactor: Rename Base.history_undo to Base.history_undo_operations.
refactor: Move the content of HistoryCommand._hcmd_rollback to BaseCli.history_rollback_transaction.
Fix AttributeError raised when BaseCli.history_rollback_transaction called.
Add history-rollback-specific transaction check error output.
remove: force from history rollback command.
Enable the "history rollback" command (RhBug:991038)
doc: Use imperative mood in documentation of the undo command.
tests: Remove unneeded test of HistoryCommand.doCheck.