Check all accumulated variables TP,ISWR, ILWR

[joelfiddes]

In era5 accumulated variables treatment changed from accumulated since forecast start to accumulated over last timestep. As I understood it a 3h step precip value is still precip over 1h. To be honest docs confuse the hell out of me so we should double check this once eg:

https://confluence.ecmwf.int/pages/viewpage.action?pageId=197702790
https://confluence.ecmwf.int/pages/viewpage.action?pageId=74764925

Diffenernt issue buyt interesting about "rain bombs" in era5:
https://confluence.ecmwf.int/display/CUSF/ERA5+versus+ERA-Interim+Total+Precipitation

Example issue:

Topo_scale.py l.169
down_pt['tp'] = surf_interp.tp * 1 / tstep_dict.get(tstep) * 10**3 # Convert to mm/hr

should be, I think:
down_pt['tp'] = surf_interp.tp * 1 / 1* 10**3 # Convert to mm/hr

or just:
down_pt['tp'] = surf_interp.tp * 10**3 # Convert m/hr to mm/hr