added ease of use feature of what_is function
- suppose the user gave a long arg, say
--input, we don't have to call what_is('input') to get the value. We can simple call _what_is with the corresponding shortarg, say-i. -> what_is('i'). - vice versa
--input, we don't have to call what_is('input') to get the value. We can simple call _what_is with the corresponding shortarg, say -i. -> what_is('i').