Fix #437: Delete to standard Trash directory https://github.com/BestImageViewer/geeqie/issues/437 The method of file deletion is changed. The Preferences/Behaviour option "Safe delete" is removed. The user has the option to choose Geeqie-defined trash bin or system-defined trash bin as the normal mode - set in Preferences/Behaviour. Menus have two entries: Move to trash and Permanent delete. The Delete key moves to trash; shift-Delete deletes permanently. Both Move to trash and Permanent delete have user-selectable confirmation, set in Preferences/Behaviour. This means the function of the Delete key is changed from Permanent delete to Move to trash, which is a fail-safe change.

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