ROUTINE
-------

INT_ ug_io_read_tags_file (int *argc,
                           char ***argv,
                           char Case_Name[],
                           INT_ Message_Flag)

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

Read AFLR surface grid BC and normal spacing data from a standard UG tags data
file.

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

argc                     : Number of arguments.
                           Same as passed to AFLR.

argv                     : Argument vector.
                           Same as passed to AFLR.

Case_Name                : Case name for Tags data file.
                           If a file named Case_Name.tags is found then it is
                           read.

Message_Flag             : Output message flag.
                           If Message_Flag =  0 then no information messages
                           are written.
                           If Message_Flag >= 1 then information messages are
                           written to standard output.

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

0                        : No errors occurred reading tags data file.
<0                       : The tags data file name is blank or NULL.
                           Nothing is done in this case.
                           The return value will be -1.
>0                       : Errors occurred reading the tags data file.
                           The return value will be between 600 and 699.

OUTPUT ARGUMENTS
----------------

argc                     : Number of arguments.
                           Same as passed to AFLR with additional arguments
                           added based on data found in the Tags file.

argv                     : Argument vector.
                           Same as passed to AFLR with additional arguments
                           added based on data found in the Tags file.
