addr_to_string, string_to_addr

[Bruno H. <br...@cl...>]

Hi Sam,

addr_to_string, string_to_addr are exported from socket.d through genclisph.d.
Therefore they need to be declared in lispbibl.d. I did this.

Can you please
  - add documentation specifying what these functions do (both lispbibl.d and
    socket.d),
  - mark them as "can trigger GC" and "maygc" if appropriate (also both
    lispbibl.d and socket.d)?

Bruno