last commit in the year of 2013

- EMH : begin to add the modified Fowler-Nordheim tunning mechanism in the tunneling solver
add modified Fowler-Nordheim tunneling

- NEW : add the mechanism of MFN in dd solver (update the rhs in consideration of MFN)
- NEW : add corresponding physics property for MFN
- NEW : add corresponding method in SolverPack
- NEW : add MFN in tunneling solver, only in the tunneling process from substrate to trapping layer
- ENH : modify some of the names in tunnel solver
- FIX : fix the a bug in the tunnel solver for tunneling from trapping layer to gate. the gate voltage should be obtained from global control
Merge branch 'addMFN'