suzaku xis 5x5 and 3x3 files

Checked in a change to xselect so that when there is a mix of 5x5 and 3x3 suzaku xis files read in then, when doing an extract, xis5x5to3x3 is used to create a temporary 3x3 file. This was requested by the xis team and ensures that doing an extract event creates a correct output 3x3 file. At the moment we aren't doing anything with the extra information in the 5x5 file.