Atom(s:Str):Int
Creates an atom from a string. An atom is a number that can be mapped back to the string using AtomStr(). Calling Atom() again with the same string will return the same value. However, the mapping is not necessarily identical in different sessions.
The empty string "" always maps to the atom 0. If the parameter is EMPTY, returns EMPTY.
Since: PCC 1.0.12, PCC2 1.99.8
