cwltool: Add a compute_checksum optional argument to compute_checksum with default value of True. When False, skip checksum computing which can be expensive.
cwltool: Add a compute_checksum optional argument to compute_checksum with default value of True. When False, skip checksum computing which can be expensive.

chapmanb/cwltool,dleehr/cwltool,dleehr/cwltool,jeremiahsavage/cwltool,chapmanb/cwltool,SciDAP/cwltool,common-workflow-language/cwltool,jeremiahsavage/cwltool,chapmanb/cwltool,common-workflow-language/cwltool,common-workflow-language/cwltool,jeremiahsavage/cwltool,chapmanb/cwltool,jeremiahsavage/cwltool,SciDAP/cwltool,dleehr/cwltool,dleehr/cwltool,SciDAP/cwltool,SciDAP/cwltool