Returns a Boolean value indicating whether the specified key is in the specified table.
Original signature is '- (BOOL)isKey:(NSString *)key inTable:(NSString *)table'
Available in Mac OS X v10.0 and later.


YES if the key is in the table; otherwise, NO.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)