Change behavior of `cable_type` to fix unavailable large cable type error
Change behavior of `cable_type` to fix unavailable large cable type error

Before: If a cable type during grid connection of LV generators lead to
an error

Now: If current of generator is exceeding I_th_max, largest cable type
is chosen. The issue of line overloading still remains

Just to let u know, @nesnoj. If u got ideas how to solve the remaining
issues, I'm interested ;-)

openego/dingo,openego/dingo