Add a warnNA argument to stop annoying messages

[mem48]

I got this test failure

Duration: 30.2s

> checking Rd \usage sections ... WARNING
  Undocumented arguments in documentation object 'ways'
    'limit' 'types' 'wayFields' 'zoom'

  Functions with \usage entries need to have the appropriate \alias
  entries, and all their arguments documented.
  The \usage entries must correspond to syntactically valid R code.
  See chapter 'Writing R documentation files' in the 'Writing R
  Extensions' manual.

0 errors v | 1 warning x | 0 notes v
Error: R CMD check found WARNINGs
Execution halted

Exited with status 1.

But I don't think it is related to this PR

[mem48]

@Robinlovelace can you approve?