Furthermore, gtest.h included only in main.cpp, not in every single test (=> only tiny speed gain).

renamed UnitTests/ subdirectories; not yet worked on the form factor tests.

- Form factors of polyhedron and polygonal prism now compute vertex positions etc
  upon call of onChange().
- ParameterPool and RealParameterWrapper now have an attribute m_parent pointing
  to an IParametrized object. When a value is set, m_parent->onChange() is called.
  This mechanism is experimental; a possible alternative, registration of lambda
  functions, may be rediscussed later.
- Parameter names of polygonal prisms and polyhedra somewhat unified: edge and
  base_edge instead of length and radius.
- Tests will be repaired or improved under issue 1294.

Missing tests will be reactivated or written under issue 1294.

Fixed mouse tracking for ColorMapPlot when switched to projections mode, so status string gets updated

Fixed bug in RealTime widget (app crashes when remove all jobs from list and then switch to realtime view)

Replaced another typedef (shared_ptr<ISampleBuilder>).

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.

expand parameter_t (no typedef as alias for lengthy class names, except perhaps ocasionally at file scope)

Merge branch 'precompute' into develop - before starting to really work on the precomputation mechanism