stdlib modules have -M suffix for dir ;; frame for lists example

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-# Command-Line Arguments
-
-Inferno has a dedicated module for processing commandline flags and arguments, [arg(2)](http://man.cat-v.org/inferno/2/arg). 
-
-## Source
-
-### args.b:17,22
-
-The module `Arg` is loaded and initialized. As per the manual, the `arg->init()` function must be called before any other functions can be called from `Arg`. 
-
-The usage message is also set pre-emptively for use later, if necessary.
-
-### args.b:24,37
-
-There are two flag arguments, `r` and `c` which set reversal of arguments and the list item indicator mark, respectively.
-
-The flag `r` is a binary option toggle, the flag's presence as an argument is sufficient to change the value of `rev`. 
-
-The flag `c` takes an argument. The `arg->earg()` function is used to pop the flag's argument out of the list. Specifically with regards to `earg()` rather than `arg()` as per the manual, `earg()` will call `arg->usage()` if the relevant argument does not exist. 
-
-Note: After the processing of all flags, `argv` is re-set from the value contained within `arg` to remove the elements (if any) utilized by flags and their arguments. 
-
-### args.b:41,51
-
-This section utilizes the `rev` variable to (naively) reverse the list `argv`. After the `rev` check, the list `argv` is printed in order from beginning to end with each element being printed on a new line with the `mark` variable being prefixed to the list element currently at the head of the `argv` list each iteration during printout. 
-
-## Demo
-
-	; limbo args.b
-	; args -h
-	usage: args [-r] [-c mark] words...
-	; args a b c d
-	Argc after flags: 4
-	→  a
-	→  b
-	→  c
-	→  d
-	; args -r a b c d
-	Argc after flags: 4
-	→  d
-	→  c
-	→  b
-	→  a
-	; args -c 'quack: ' a b c d
-	Argc after flags: 4
-	quack:  a
-	quack:  b
-	quack:  c
-	quack:  d
-	; args -r -c '-> ' d c b a
-	Argc after flags: 4
-	->  a
-	->  b
-	->  c
-	->  d
-	; 
-
-## Exercises
-
-- Can you trick `earg()` into accepting a nil value?
-- How would you pull an `int` out of `earg()`?
-- How would you trip the `usage()` message call-able from `earg()`?