refactored maximal_independent_set code added (disabled) MIS compaction optimization
refactored maximal_independent_set code
added (disabled) MIS compaction optimization

vkirangoud/cusp-library,gshashidhar125/cusp-library,victordion/cusp-library,victordion/cusp-library,tectronics/cusp-library,gshashidhar125/cusp-library,tectronics/cusp-library,gshashidhar125/cusp-library,vkirangoud/cusp-library,tectronics/cusp-library,baiyunping333/cusp-library,baiyunping333/cusp-library,victordion/cusp-library,baiyunping333/cusp-library,baiyunping333/cusp-library,gshashidhar125/cusp-library,tectronics/cusp-library,vkirangoud/cusp-library,vkirangoud/cusp-library,victordion/cusp-library