[Midnightbsd-cvs] src: termcap.src: Improve 256 color support.

[laffer1 at midnightbsd.org]

Log Message:
-----------
  Improve 256 color support.

  - Add screen-256color,
  - Improve rxvt-256color to set pa and op properly.
  - Add rxvt-unicode-256color as an alias to rxvt-256color.

Modified Files:
--------------
    src/share/termcap:
        termcap.src (r1.5 -> r1.6)
        (http://cvsweb.midnightbsd.org/src/share/termcap/termcap.src?r1=1.5&r2=1.6)