the drift diffusion result is obtained in this version

- FIX : fix the dd matrix. use the normalized equation now
- FIX : fix the rhs refreshing method in dd solver. remove the q factor (q should be removed after normalization)
- FIX : fix the condition of vertex for a boundary condition of current density
- FIX : fix the bug of setting boundary conditions for current (dd area) when constructing the structure in SimpleONO.cpp// however, current method can only be used in simple structures. Examine carefully in the case of complicated domain.
- NEW : set current density boundary condition in dd test class
- NEW : add the method for refreshing the value of boundary condition in DomainDetails.cpp
- ENH : add the current density factor in normalization method