R/qtl version 1.48-1

[Karl Broman]

A new version of R/qtl (1.48-1) has been released at its website (https://rqtl.org) and on CRAN. Windows and Mac binaries will be available on CRAN within a few days.                                                                     
                                                                                                                      
This fixes a bug in R/qtl in the case of QTL on the X chromosome; see https://github.com/kbroman/qtl/blob/master/NEWS.md                                                                                                                   
                                                                                                                      
Karl Broman