Some questions about restart

[M2tHane]

I encountered two issues, and the second issue appeared after fixing the first one.

1. File "H:\cosipy-new\cosipy\cpkernel\io.py", line 140, in create_data_file timestamp = start_timestamp.strftime("%Y-%m-%dT%H-%M")
   AttributeError: 'numpy.datetime64' object has no attribute 'strftime'
   The issue was resolved when I modified the code in io.py lines 134-135 as follows.
   start_timestamp = self.get_datetime(time_start, use_np=False)
end_timestamp = self.get_datetime(time_end, use_np=False)

2. File "H:\cosipy-new\cosipy\cpkernel\init.py", line 132, in load_snowpack\n new_snow_height = np.float64(GRID_RESTART.new_snow_height.values) AttributeError: 'Dataset' object has no attribute 'new_snow_height'

[benatouba]

Thx for reporting that. I created a pull request for this.