added some comments and the dist-r target for r libraries
added some comments and the dist-r target for r libraries

PATRIC3/dev_container,olsonanl/dev_container_kb,kbase/dev_container,kbase/dev_container,PATRIC3/dev_container,SEEDtk/seedtk,SEEDtk/seedtk,olsonanl/dev_container_kb