thorium: fix a memory leak (not obvious) in node.c

Reported-by: Huy Bui <huybui@anl.gov>
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
core: add a wrapper around murmur hash

Link: https://github.com/GeneAssembly/biosal/issues/689
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
memory: fix memory operation tracker

Link: https://github.com/GeneAssembly/biosal/issues/710
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>