Splits a string at the places given by the token, for example:
strtok("abcbdef","b") => {"a","c","def"}
strtok("abcbdef","cd") => {"ab","ef"}
Note: strtok does not return empty tokens. To split a read file into lines, use stringSplit instead (splits only on character).
function strtok input String string; input String token; output String[:] strings; end strtok;