genomics: increase pool chunk size for aggregators

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
memory:  add BGQ initialization routine for memory system

The ticket #824 shows that 4 GiB is lost to fragmentation.

Hopefully, this patch will solve the issue.

Link: https://github.com/GeneAssembly/biosal/issues/824
Suggested-by: Hal Finkel <hfinkel@anl.gov>
Link: https://github.com/GeneAssembly/biosal/issues/827
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>