TT detector description and implementation of the survey measurements

The TT geometry in the software has been updated to comply with the latest technical drawings. The main difference is in the description of the beam pipe insulation, where the amount of material has increased from $7.5\%$ to $15.4\%$ of $X_0$. Mother volumes are added to decrease the CPU consumption and finally several scans are made to compare the material budget between the DC06 geometry and the new 2008 geometry. In addition, the survey measurements of the TT detector have been analysed. These measurements can be subdivided into surveys of the detector box, photogrammetry of the balconies and metrology of the half-modules. The offsets with the nominal geometry are implemented in the alignment condition database.