Use GiB as default unit for memory

As a result, K arg has been added to -u option to
see memory in KiB.

kvmstats.sh

@@ -1,16 +1,19 @@
 #!/bin/sh
 
 usage () {
-	echo 'usage: kvmstats.sh [-u M|G]'
+	echo 'usage: kvmstats.sh [-u K|M|G]'
 	exit 1
 }
 
-POW=$(echo 1024 ^ 1 | bc)
+POW=$(echo 1024 ^ 3 | bc)
 while echo $1 | grep -q '^-[[:alnum:]]'
 do
 	case $1 in
 	'-u')
 		case $2 in
+		'K')
+			POW=$(echo 1024 ^ 1 | bc)
+			;;
 		'M')
 			POW=$(echo 1024 ^ 2 | bc)
 			;;