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
Merge pull request #126 from hlkline/upstream_dev

Mass flow rate and supersonic inlet adjoint bc's (euler)