Obtains all values (0 or more) associated with a keyword.
2002-02-04 ROwen Allowed additional characters in undelimited strings.
Now all ascii printable characters are allowed except ,;='"` the first 5 are crucial; the others are excluded
to enhance readability and reduce possible confusion.
2003-11-19 ROwen PR 10 fix: could return nextInd=-1 (for 'key=');
this could cause the caller to go into an infinite loop.
Modified to permit keys with = but no values.
2004-09-14 ROwen Renamed variable str in test code.