D12226: balooshow: Colorize only when attached to terminal

[Stefan Brüns]

bruns added reviewers: bruns, FreeBSD.

REPOSITORY
  R293 Baloo

REVISION DETAIL
  https://phabricator.kde.org/D12226

To: michaelh, #baloo, bruns, #freebsd
Cc: #frameworks, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, 
alexeymin