Output caller's file name and line at FEEDBACK
Output caller's file name and line at FEEDBACK

FEEDBACK logger always outputs this logger's file name and line e.g.

thatswhyyoualwaysleaveanote.go:175 (FEEDBACK.Println)
thatswhyyoualwaysleaveanote.go:183 (FEEDBACK.Printf)

to a log file.

Instead of it, this makes FEEDBACK logger output its caller's file name
and line to a log file to provide more useful information.

spf13/jwalterweatherman,spf13/jWalterWeatherman