Improved version of the ALICE geometry manager. The main improvements are: a) LUT...

Improved version of the ALICE geometry manager. The main improvements are: a) LUT with original (ideal geometry) matrixes for all the sensistive volumes. The LUT is initialized before misaligning the geometry; b) New method LoadGeometry() which can be used to load the geometry either from CDB (default case) or from user-defined geometry.root file; c) The Instance() method has been removed and all the public methods become static. All the access to the geometry is done via pointer to the loaded TGeoManager insted of gGeoManager. This should allow, for example, AliEVE to load several geometries in one session.