add a timer for the whole running time in argonnite

Link: https://github.com/GeneAssembly/biosal/issues/436
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
add document about stateless actors vs stateful actors

Link: https://github.com/GeneAssembly/biosal/issues/439
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
enable 2-bit encoding for all codecs

Link: https://github.com/GeneAssembly/biosal/issues/437
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>