/*D
   MPI_Add_error_string - Associates an error string with an MPI error code or class

Synopsis:
.vb
int MPI_Add_error_string(int errorcode, const char *string)
.ve

Input Parameters:
+ errorcode - error code or class (integer)
- string - text corresponding to errorcode (string)

Notes:
The string must be no more than 'MPI_MAX_ERROR_STRING' characters long.
The length of the string is as defined in the calling language.
The length of the string does not include the null terminator in C or C++.
Note that the string is 'const' even though the MPI standard does not
specify it that way.

According to the MPI-2 standard, it is erroneous to call 'MPI_Add_error_string'
for an error code or class with a value less than or equal
to 'MPI_ERR_LASTCODE'.  Thus, you cannot replace the predefined error messages
with this routine.

.N ThreadSafe

.N Fortran

.N Errors
.N MPI_SUCCESS
.N MPI_ERR_ARG
.N MPI_ERR_OTHER

D*/

