Changing Precipitation and Runoff array shape to 1D

[MostafaGomaa93]

The shape of some fluxes (precipitation and runoff fluxes) is changed from a time-series array to a 1D array in the STEMMUS-SCOPE code in issue 280. The aim is to correct the retrieval of those variables in BMI (currently they are not correct).

The edits are in the variable_reference.py to be compatible with the STEMMUS-SCOPE code changes.

The edits are the following:

• Precipitation -> Line 31
• Effective precipitation ->Line 67
• Total Runoff -> Line 123
• Dunnian Runoff -> Line 141
• Hortonian Runoff -> Lines 132

Adding also extra fluxes

• Liquid precipitation ->Lines 40-47
• Snow precipitation ->Lines 48-56
• Snow accumulated precipitation ->Lines 58-65
• Energy top flux ->Lines 177-185
• Energy bottom flux ->Lines 186-194