Fix project rm -r warning (#565)
Fix project rm -r warning (#565)

Only warn if attempting to delete an entire project, not a subfolder or file-id.
dnanexus/dx-toolkit,dnanexus/dx-toolkit,dnanexus/dx-toolkit,dnanexus/dx-toolkit,dnanexus/dx-toolkit,dnanexus/dx-toolkit,dnanexus/dx-toolkit,dnanexus/dx-toolkit