Use overloading in parallel

This issue was created automatically from an original CUE issue. Further discussion may take place here.

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Fortran allows overloading using interface.

For example we could do something like that:
interface p_max
subroutine p_imax(i)
integer i
end subroutine
subroutine p_dmax(d)
double d
end subroutine
end interface

integer i
double precision d

call p_max(i)
call p_max(d)

Just need to check that it works with nag it should as it is in the Fortran Standard
Example here (http://www.mathcs.emory.edu/~cheung/Courses/561/Syllabus/6-Fortran/overloading.html)