Less should leave history of command under tmux

     Before less or more didn't leave history of scrolled content.
     This allow it to save it on tmux scroll back.
Hot-Fix term handling in Vim under Tmux.

    kchris color scheme uses 256 colors.
    Not every terminal have 256 colors capability.
    Raw terminals(vga, frame buffer) don't have it.
    This partially solves the issue for Vim. But another problem is
    show up. Tmux sets the TERM to screen, which is not handled well in
    Vimrc. So right now it falls back to safe color scheme  that looks
    well under fancy(xterm) and raw(vga) terminal.
    Better solution is desired. Either tmux should detect the situation
    and set TERM appropriately or Vim should do it.