changed the default to "no weighting" for the general conversion to NASA
changed the default to "no weighting" for the general conversion to NASA

also, added to documentation

chatelak/RMG-Py,nyee/RMG-Py,pierrelb/RMG-Py,KEHANG/RMG-Py,faribas/RMG-Py,KEHANG/RMG-Py,enochd/RMG-Py,chatelak/RMG-Py,nickvandewiele/RMG-Py,nickvandewiele/RMG-Py,pierrelb/RMG-Py,nyee/RMG-Py,faribas/RMG-Py,comocheng/RMG-Py,enochd/RMG-Py,comocheng/RMG-Py