Minor stylistic changes in comments, style, and output feedback

- Removed unused and irrelevant included headers
- Removed commented code
- Got rid of std namespace
- StiPxlDetectorBuilder: Reordered data members
- StiXxxDetectorGroup: Cleaned up header includes
StiSstDetectorBuilder: Similar to PXL and IST detector builders use object with direct access to database (mSstDb) instead of StSsdBarrel
StiSstDetectorBuilder: Use transformation matrices for sensitive layers from database when non-ideal geometry is requested
StiSstDetectorBuilder: Removed debugging function used for testing of manually modified volumes