fixes parameter handling

cpp/field.cpp

cpp/full_code/NSVE_field_stats.cpp

cpp/full_code/field_single_to_double.cpp

cpp/full_code/field_single_to_double.hpp

cpp/full_code/get_3D_correlations.hpp

cpp/full_code/get_velocity.hpp

cpp/full_code/joint_acc_vel_stats.hpp

cpp/full_code/pressure_stats.hpp

cpp/full_code/resize.cpp

cpp/full_code/resize.hpp

cpp/full_code/write_rpressure.hpp