9/15    Emacs question.. I use meta-Q to reflow a paragraph. How can
        I set the right-side end-of row width for the text?
        \_ M-x set-variable <RET> fill-column
        \- C-x f runs the command set-fill-column  --mr. emacs
           \_ "set-fill-column requires an explicit argument"
              \- as RMS said to me about 15 yrs ago "universal argument"
              \_ C-h k C-x f
        \_ M-x set-variable <RET> default-fill-column to set it for all
           buffers.  Then you can override it in individual buffers by setting
           fill-column.
                \- i rarely want to set it for all buffers [or would
                   use a hook or .emacs setting]. also often you want to
                   set it to the current cursor column. anyway, ymmv.