CRON_cronManagementDialog

Description: Shows a dialog for viewing, adding and deleting crontab entries for a given user, command and identifier.
Parameter:

• user: The user the cron job should be run under.
• cmd: The command to exectute.
• identifier: A string to identify the cron entry (for deletion)
• runInScreen: Set to true if the command should be run in a screen.