parallel plate testcase

Single electron is accelerated according to electric field in plate capacitor
Coupled Power output is compared with following analytical solution
Constant direct current => constant acceleration:
- $a=\frac{Eq}{m}$
Time derivation => velocity:
- $v=\frac{Eq}{m}t$
Time derivation => distance:
- $s=\frac{1}{2}\frac{Eq}{m}t^2$
Coupled Power:
- $P=vF=vEq=\frac{E^2q^2}{m}t$
parameter.ini for activating coupled Power output
```
    CalcCoupledPower = T
```