Adding some comments about the different locations of live-build in the central lb wrapper.

bin/lb

@@ -55,12 +55,15 @@ case "${1}" in
 
 		if [ -x "${LIVE_BUILD}/scripts/build/${COMMAND}" ]
 		then
+			# User has live-build copied locally in the system
 			SCRIPT="${LIVE_BUILD}/scripts/build/${COMMAND}"
 		elif [ -x /usr/lib/live/build/${COMMAND} ]
 		then
+			# User has live-build installed in the system
 			SCRIPT=/usr/lib/live/build/"${COMMAND}"
 		elif [ -x "$(which ${COMMAND} 2>/dev/null)" ]
 		then
+			# User has live-build commands in path
 			SCRIPT="${COMMAND}"
 		else
 			Echo_error "no such script: ${COMMAND}"