Add byte/kilobyte/megabyte/gigabyte unit for memory/heap_size column

[zhongwencool]

	Pid	Memory	Name or Initial Call	Reductions	Msg Queue	Current Function
1	<0.853.0>	1.5M	code_server	74885	0	code_server:loop/1
2	<0.1040.0>	5kb	release_handler	7365	2	gen_server:loop/6