message: Renames AXOM_NOT_USED macro to AXOM_UNUSED_PARAM
  This is more consistent with the `AXOM_UNUSED_VAR`
  and the `AXOM_DEBUG_PARAM` macros.
diff: /*!
  *
  - * \def AXOM_NOT_USED(x)
  - * \brief Macro used to silence compiler warnings in methods with unused
  - * arguments.
  + * \def AXOM_UNUSED_PARAM(x)
  + * \brief Macro used to silence compiler warnings in methods with unused arguments.
  * \note The intent is to use this macro in the function signature. For example:
  * \code
  *
  - * void my_function(int x, int AXOM_NOT_USED(y))
  + * void my_function(int x, int AXOM_UNUSED_PARAM(y))
  * {
  * // my implementation
  * }
  *
  * \endcode
  */
  -#define AXOM_NOT_USED(x)
  +#define AXOM_UNUSED_PARAM(x)
  /*!
  *
  