Fix docstring for regrow/filter-excludes
Don't insert :refer vector for mass referred namespaces

e.g. (:require [my.ns :refer [foo] :refer :all]) is not valid.
Allow certain libspecs to have keys on multiple lines

The following require form fits nicely on one line:

    (:require [my.ns :as ns :refer [alpha beta gamma]])

If the vector of refers is long, it overflows to the next line but the
:refer key stays on the first line:

    (:require [my.ns :as ns :refer [alpha beta gamma delta epsilon
                                    zeta eta theta]])

This may not work nicely when there are two libspecs options that are
collections:

    (:require [my.ns :as ns :refer [alpha beta gamma delta epsilon
                                    zeta eta theta] :rename {alpha α,
                                                             beta β,
                                                             gamma γ}])

In this case, allow each option pair to start on a new line:

    (:require [my.ns :as ns
               :refer [alpha beta gamma delta epsilon zeta eta theta]
               :rename {alpha α, beta β, gamma γ}])