Refactoring spectra adding decibel, gain and factor classes and making spectrum and third octate spectrum partly abstract.

Refactoring ITA HDFT spectrum and spectra, now uses std::vector instead of malloc/free. And ITA-style BigCaps methods.

Style and little fix in ITAStopWatch string converter. Also added outstream operator for stopwatch statistics

Removing WINNT version preproc overwrite from almost everywhere, troubling boost or tbb. Current (haha) windows is now required to access try-lock kernel functionality.

Moving interpolation routines (from VDL implementation) to ITABase and making them available for public use