xspec bugs update

Not much activity in xspec bug reporting and fixing. The only recent patch is

12.5.1o Small fix to calculation of plot emodel/eemodel and eufspec/eeufspec when in setplot wave mode. This correction is only noticeable for very wide bins (bin widths approximately the size as the bin energy).

xselect and Einstein IPC data

Rich Mushotzky reported that xselect doesn't work on Einstein IPC event files. This was due to a bug in reading data from the MDB which only appears to be triggered in this specific case. I've checked in a fix. A workaround is to run extractor on its own and specify the xfkey, yfkey, xhkey, yhkey, and phamax hidden parameters.