improve performance of alchemical free energy calculations
Top-level task for SIMD and GPU-accelerated alchemical free energy calculations work.
Create dedicated subcounter for nonbonded FEP
Now all nonbonded work has their own separate subcoutners which allows
measuring the performance of each task separately.
Inline functions of calculations of FE interaction types.
The functions are so far only templated on the real
requirements of the softcore that is used.
This is one step towards templating the calculations