Updated solver with SU2_PHI
Minor output.
Final MG update
Merge pull request #125 from su2code/feature_MultiGrid

Important improvements in MG, CuthillMckee ordering and linear solvers
Bug fixing
adding massflowrate objective fnct adjoint. also changing freestream sensitivity to include inlets
mass flow rate objective function adjoint
added config options group to doxygen
more doxygen comments added
 massflowrate added as output; added to history file if obj fun is massflow
 added CEULERADJ supersonic inlet BC
supersonic inlet bc
small fixes