Cleanup
Provide CMake option to enable warnings on unix
Freebies: use the same delimiter when saving moment arms files
Modify input of muscle configurations

Instead of having separate muscles.in and dofs.in files,
put the list of relative degrees of freedom after each muscle in muscles.in.
Put functions for reading these files into separate .h and .cpp files
Change angles.in structure

Instead of being the number of angles, the fist line of the file now
is supposed to contain the names of the degrees of freedom that
each column represents