[bug #60060] support other printing directions (right to left, top to bottom)

[Dave]

Follow-up Comment #1, bug #60060 (project groff):

John Gardner pointed out (http://lists.gnu.org/r/groff/2020-07/msg00069.html)
that neatroff supports right-to-left text.  Neatroff's documentation
(http://litcave.rudi.ir/neatroff.pdf) says that it uses the .<< and .>>
requests and \< and \> escape sequences to access this feature, so it might
behoove groff to use compatible syntax (e.g., if groff wants to support
top-to-bottom rendering with the same requests, they could take an argument to
indicate the text direction, as neatroff's .<< and .>> requests take no
arguments).  This would, however, torpedo the proposed use of \< and \> kicked
around over in bug #60571.

Heirloom, like groff, is strictly left to right.


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