This is needed because a task dialog's open() function still fails to open a transaction when it checks for a pending transaction and auto
transaction is still enabled.
Can be enabled/disabled through preferences => Connected to 'SaveWBbyTab' parameter
Workbench is saved when it is changed or when a new subwindow is created
It is restored when subwindow is activated if one was previously saved
1 - Reports the error to the user in a popup.
2 - Names of the backups include the timstamp instead of a number. Names have more sense and the files can be sorted by names what is also the age order.
3 - Behaviors when changing configuration improved, the number of files present on the system was not reduced when reducing the number of backups or backups deactivated.