This will allow us to notify the parent about changed parameter values.
Accompanying changes and problems:
- The default constructor ParameterPool() is deleted, to enforce
  presence of a parent.
- Therefore several tests had to be outcommented (marked as
  TEMPORARILY DISABLED). Improved tests should make more
  realistic use of ParameterPool, providing it an IParameterized* parent.
- The function IParameterized::getParameters() is outcommented.
  It was only used in some tests, and for printout. In printout
  functions, it is temporarily replaced by fixed text.

Removed Simulation::normalize() from public interface; normalization is now automatic when beam intensity > 0

Add polarization density to Beam and Detector with interface for passing the Bloch vector; added Beam and Detector polarization to DWBASimulation initialization

automatically aligned (which enables vectorization for them)

refactored other classes to accomodate this change

1. ScalarRTCoefficients
2. SpecularMatrix (not sure. need to check)
3. MatrixRTCoefficients
4. Beam (revise existing BeamTest)
5. ScalarSpecularInfoMap
6. MatrixSpecularInfoMap