problem with tmp.nc in Load

Hi,

When Load does an interpolation of observation or model files it generates a file named "tmp.nc". Because of this it's not possible to run various Load in the same directory. Moreover the error due to this problem is not really clear and it takes quite of lot of time to understand where does the error comes from. Would it be possible to change the name of the tmp file in the new version of Load? It can be for example tmp_exp_var_startdate_leadtimemin_leadtimemax.nc. I think it makes more sense to include this in the new version of Load, which will be available very soon. What do you think @nmanubens ?