Merge branch 'js/add-i-color-fix'

"git add -i" failed to honor custom colors configured to show patches, which has been corrected. * js/add-i-color-fix: add -i: verify in the tests that colors can be overridden add -p: prefer color.diff.context over color.diff.plain add -i (Perl version): color header to match the C version add -i (built-in): use the same indentation as the Perl version add -p (built-in): do not color the progress indicator separately add -i (built-in): use correct names to load color.diff.* config add -i (built-in): prevent the `reset` "color" from being configured add -i: use `reset_color` consistently add -p (built-in): imitate `xdl_format_hunk_hdr()` generating hunk headers add -i (built-in): send error messages to stderr add -i (built-in): do show an error message for incorrect inputs