read-line function, and print function

[erkkikeranen]

user=> (do (print "What is your name? ") (let [s (read-line)] (println "Hello, " s)))
What is your name? Erkki
Hello, Erkki
nil
user=>

includes "compatible interface" to clojure core

• flush
• new-line
• pr
• prn
• print
• println

variables (required if & truthiness and some other glue to work, but is prepared for pr, prn, print and println)
flush-on-newline
print-readable

Also:

• changed nanotime -> nanoTime to match clojure symbol name
• System/getenv to get env variables the same way as in clojure
• fixed name space for Thread and System
• fix broken unit test for divide

[Tko1]

In Summary:

Rewrite println purely in Clojure, rather than creating a new rust wrapper -- or, as always, explain if there's more to it