Initial addition of R/scanonevar.R, with code from Lars Ronnegard
Edits to scanonevar:

 - output as scanone object
 - remove plotting and summary aspects
 - prints -> warnings
MASS and dglm as Imports in DESCRIPTION file
.Rd file for scanonevar, change names of args, export in NAMESPACE
Remove accents from scanonevar.Rd; was giving error
scanonevar.R: needed dglm:: in call to dglm.control