Fix #543 FieldTmp Algorithms

- the `particleToGrid` algorithms forgot a small fraction
  of *all* algorithms since `beta-rc5`
- the algorithm `ParticleCounter` was broken completely due to this

The correction of the defintion of the "Counter" Shape (NOT a real shape
such as NGP) and the loop that calculates the values for the affected
cells fixes that.
Merge pull request #559 from ax3l/fix-particleToField

Fix #543 FieldTmp Algorithms