plparseopts: parse arguments for Fortran

`plparseopts`: parse arguments for Fortran
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#### `plparseopts`: parse arguments for Fortran

`plparseopts (` | mode`)`;

When called from Fortran, this routine has the same effect as when invoked from C (see `plparseopts`) except that the argument list just contains the parsing mode and the Fortran system routines `iargc` and `getarg` are used internally to obtain the number of arguments and argument values. (Note, during configuration, the user's Fortran compiler is checked to see whether it supports `iargc` and `getarg`. If it does not, the Fortran plparseopts simply writes a warning message and returns.

`mode` (``PLINT``, input)

  Parsing mode; see `plparseopts` for details.

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