add a macro to detect jitter

Link: https://github.com/GeneAssembly/biosal/issues/721
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
genomics: reduce number of visitors

Link: https://github.com/GeneAssembly/biosal/issues/720
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>