simplify the handler interface

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
send signal to build graph

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
add assembly stores

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
spawn graph stores

Link: https://github.com/GeneAssembly/biosal/issues/496
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
fix actor_get_spawner

Link: https://github.com/GeneAssembly/biosal/issues/503
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
rename order.mk to Makefile.mk

Link: https://github.com/GeneAssembly/biosal/issues/501
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
split Makefile.mk

Link: https://github.com/GeneAssembly/biosal/issues/502
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
fix tags in genomics

Link: https://github.com/GeneAssembly/biosal/issues/504
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>