use the self variable name for structures

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
use the self variable name for manager, thread, and timer

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
fix white spaces

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
add graph store

Link: https://github.com/GeneAssembly/biosal/issues/196
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>