changed default popup background color and color schemes

 * use black on light white as the default popup colors
   (e.g. in --no-profile mode). this looks less annoying than
   black on light blue and is more often more readable
   (since light blue will be rendered quite dark often).
   It's no longer necessary to highlight the popup with (distinct)
   colors.
   Keeping the foreground black ensures that there's a brighter
   foreground color for bold entries in case the terminal does
   not support bold fonts.
 * the `terminal.tes` scheme keeps the default popup style.
   However since it uses white on black as the default colors,
   this will often still stand out from the message line
   (on 16 color terminals).
 * `solarized.tes` now uses a similar high-contrast popup style
   with either a bright or dark background.
   The foreground colors have been chosen so that bright variants
   exist for non-bold terminals - although these bright variants
   do not stand out very much.

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