fix merging problem when seuqncing errors have high coverage

Link: https://github.com/sebhtml/ray/issues/229
Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
fix remaining issues with merger

test:

[boiseb01@ls30 AZPAE14881-1]$ grep Warning AZPAE14881-check.1.*|wc -l
0
[boiseb01@ls30 AZPAE14881-1]$ grep Error AZPAE14881-check.1.*|wc -l
0

Link: https://github.com/sebhtml/ray/issues/229
Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
add a logger

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
remove debug messages from merger

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>