set default reserved-symbols to blank
move some fn to readers ns
add will-output-nothing?
add require-no-trailing?
move ignorable-args? to reader ns
use bracket-block in emit-block-if
use with-bracket-block in emit "while"
use with-bracket-block in emit "do-while"
use with-bracket-block in emit "dofor"
use with-bracket-block in dokeys
use with-bracket-block in try/catch/finally
use with-parens in with-bracket-block