ROUTINE
-------

INT_ ug_check_file (char File_Name[],
                    INT_ mrepeat)

DESCRIPTION
-----------

Check if file exists.

INPUT ARGUMENTS
---------------

File_Name                : File name.
                           If File_Name = "set_ug_check_file_nrepeat" then set
                           number of times to repeat check.
mprepeat                 : Number of times to repeat check.

RETURN VALUE
---------------

0                        : File exists.
<0                       : File doesn't exist or errors occurred checing file.
