Only colorize output in colordiff if terminal support it: fix has_ansi_colors to check if STDOUT is a TTY, and use it in colordiff. This allows one to alias diff to cdiff and always use it even when redirecting outpout to a file or a pager.
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Only colorize output in colordiff if terminal support it: fix has_ansi_colors to check if STDOUT is a TTY, and use it in colordiff. This allows one to alias diff to cdiff and always use it even when redirecting outpout to a file or a pager.