deltaT().value() to deltaTValue()
and
deltaT0().value() to deltaT0Value()
across the whole code - faster to return especially if being used
often, in each call to a submodel for example.
- removed/renamed one level of directories, not all constants are dimensioned
global/dimensionedConstants -> global/constants/
global/dimensionedConstants/constants/* -> global/constants/
- formatting and doxygen cleanup
- added degToRad() and radToDeg() inline functions (in mathematicalConstants)
removed equivalent degToRad() from engineTime
