[dwm] [dvtm] scrollback and 256color support

[Donald Chai]

Hi, the following two patches add support for a scrollback buffer and enhanced color in dvtm.

scrollback:



256color:
        - Allows the use of nice VIM color schemes

- Simply set up some keybinding to scrollback(), passing in "-1" or "1" to scroll up or down. - Ncurses doesn't allow more than 256 fg/bg color pairs on screen at the same time. - 8 or 256 colors only. If your terminal supports 88 colors, you need to set up your own variant of rxvt, e.g. rxvt-88color

scrollback.diff
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256color.diff
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