Correct core usage demultiplex
The core usage of the demultiplex step does not respect the core limit set within the main.sh script
The step needs to only use a maximum of cores defined by the user on the main script and not all machine resources
The core usage of the demultiplex step does not respect the core limit set within the main.sh script
The step needs to only use a maximum of cores defined by the user on the main script and not all machine resources