Merge PR #1438: Tools: Add errcheck linter

This linter ensures that all errors are checked.
This is disabled in the client directories, since its not needed on
those writes

examples/basecoin/cmd/basecli/main.go

@@ -80,5 +80,9 @@ func main() {
 
 	// prepare and add flags
 	executor := cli.PrepareMainCmd(rootCmd, "BC", os.ExpandEnv("$HOME/.basecli"))
-	executor.Execute()
+	err := executor.Execute()
+	if err != nil {
+		// handle with #870
+		panic(err)
+	}
 }