Removed digits from regtest

I do it since an error in the last digit was making the
*next* commit fail. I first change the regtest to make it clear
that it is not changing

regtest/basic/rt44/config

 type=sum_hills
 # this is to test a different name
-arg=" --min -pi,pi --max -pi,pi --bin 99,99 --hills HILLS_t1 "
+arg=" --min -pi,pi --max -pi,pi --bin 99,99 --hills HILLS_t1 --fmt %12.7f"
 extra_files="../../trajectories/HILLS_t1"