inconsistent inflows for single and multiple flow direction

[landam]

Inflows for single and multiple flow direction are coded differently.

(example from rain_sim)

Single (for single cell):

[[-1, 0]]

means inflow from the northern cell.

Multiple:

[0 0 1 0 0 0 0 0]

Indexes:

| 6 7 8 |
| 5   1 |
| 4 3 2 |

Problems:

• different coding
• mfda seems to be incorrect (inflow from the southern cell (?))