* * Removed C wrappers for H5Ovisit_f and H5Ovist_by_name_f, modifying the Fortran source accordingly.
* The intent for op_data was declared INOUT, even though the pointer address INTENT is, in actuality, IN. gfortran was optimizing out op_data in tests where the values were repeatedly reset to the same value. The values were reset in the test because the data the pointer targeted was updated in the callback.
* Made use of the 'verify' function to check value correctness.
* changed to useing INTEGER(C_INT) instead of C_BOOL, updated the documentation
