unused variables

[Beliavsky]

Thanks for the project.

>gfortran -c -Wextra -Wall ogpf.f90
ogpf.f90:1348:20:

 1348 |          integer:: j
      |                    1
Warning: Unused variable 'j' declared at (1) [-Wunused-variable]
ogpf.f90:1345:22:

 1345 |          integer:: ncx
      |                      1
Warning: Unused variable 'ncx' declared at (1) [-Wunused-variable]

[Beliavsky]

>gfortran -Werror=unused-parameter ogpf.f90 demo.f90
demo.f90:1350:33:

 1350 |         real(wp), parameter :: pi=4.0_wp*atan(1.0_wp)
      |                                 1
Error: Unused parameter 'pi' declared at (1) [-Werror=unused-parameter]
f951.exe: some warnings being treated as errors

[kookma]

much appreciated.
for now it is better to comment out them.
Do you have time to submit a PR?