Set default line_loss_factor as non-zero

The line loss factor of zero leads to non-mutually exclusive forward and backward flows. Therefore, the line_loss_factor should be some small value.

Author: phumthep

src/pownet/input.py

@@ -26,7 +26,7 @@ def __init__(
         spin_reserve_factor: float = 0.15,
         spin_reserve_mw: float = None,
         gen_loss_factor: float = 0.01,
-        line_loss_factor: float = 0.0,
+        line_loss_factor: float = 0.0001,
         line_capacity_factor: float = 0.9,
         load_shortfall_penalty_factor: float = 1000,
         load_curtail_penalty_factor: float = 1000,