Promulgated signature change in wmm.h into test.c.  Fixed COF filename i...

...n test.c

Changed handling of WMM model in test.c to reflect signature change in wmm_initialize.  Now test.c uses a pointer to a WMM_model, which is filled in inside wmm_initialize.  Also, changed the COF filename to match the file currently present in the filesystem.  Lastly, added a #include to wmm.h to pick up the timeval.

@cwingard Ready for review and merge
@s-pearce Ready for review and merge