Fix initialisation problem for halo of tempunstag

This solves the problem when restarting from tempunstag input with option
temperature=2, where too low temperatures are detected in the halo and lead
to a fatal error.

Author: hgoelzer

libglissade/glissade.F90

@@ -310,6 +310,7 @@ subroutine glissade_initialise(model, evolve_ice)
     call parallel_halo(model%geometry%thck)
     call parallel_halo(model%climate%artm)
     call parallel_halo(model%temper%temp)
+    call parallel_halo(model%temper%tempunstag)
 
     ! calculate the lower and upper ice surface
     call glide_calclsrf(model%geometry%thck, model%geometry%topg, model%climate%eus, model%geometry%lsrf)