system/dtach: Added to 12.0 repository

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+dtach is a tiny program that emulates the detach feature of screen,
+allowing you to run a program in an environment that is protected
+from the controlling terminal and attach to it later. dtach does not
+keep track of the contents of the screen, and thus works best with
+programs that know how to redraw themselves. It is designed to be
+transparent and un-intrusive; it avoids interpreting the input and
+output between attached terminals and the program under its control.
+
+dtach does not, however, have the other features of screen, such as its
+support of multiple terminals or its terminal emulation support. This
+makes dtach extremely tiny compared to screen, making it more easily
+audited for bugs and security holes, and also allows it to fit in
+environments where space is limited, such as on rescue disks.