Extract inner (pprint-logical-block) to its own function

This primarily serves to make the incredibly daunting cl-format routine
a little more approachable.

This change also provides a link to the Common Lisp format string spec
in the ns doc for quick reference.
Disable :miser mode during ns prettify

*print-miser-width* -> 40

    (:require [my.very.sequipedalian.namespace :refer [alpha
                                                       beta
                                                       gamma
                                                       delta epsilon]])

vs.

*print-miser-width* -> nil

    (:require [my.very.sequipedalian.namespace :refer [alpha beta gamma
                                                       delta epsilon]])
Extend print-liblist to handle libspecs with multiple options

This is what used to happen to some libspecs with both :alias and :refer
options:

    (ns foo
      (:require [clojure.pprint :as pp :refer
                                [*print-miser-width*
                                 cl-format
                                 code-dispatch
                                 formatter-out
                                 pprint
                                 pprint-logical-block
                                 pprint-newline
                                 with-pprint-dispatch
                                 write-out]]))

This now prints as:

    (ns foo
      (:require [clojure.pprint :as pp :refer [*print-miser-width*
                                               cl-format code-dispatch
                                               formatter-out pprint
                                               pprint-logical-block
                                               pprint-newline
                                               with-pprint-dispatch
                                               write-out]]))

Note that libspecs with very long namespace names, aliases, or 3+
options are unlikely to respect *print-right-margin* with the current
implementation. In practice this does not seem like a problem.