Function tfcatStatus( tfcat )

Description:
Returns a token string giving the category of TFCat compliance.

Possible return values are currently:

For non-OK values, more information can be found using the tfcatMessage function.

Parameters:
tfcat (String)
JSON string giving TFCat text
Return Value (String):
"OK" for conformant TFCat, otherwise some other value
Signature:
String tfcatStatus(String)