Prepare APIs to iriclib, to handle CGNS files easier.

[kskinoue0612]

Currently some iriclib functions needs the file names as arguments. So the code will be like below:

cg_open_f(cgnsname, CG_MODE_MODIFY, fin, ier)
cg_iricinit_f(fin)

...
do
    ...
    iric_write_sol_start_f(cgnsname, ier)

    iric_write_sol_end_f(cgnsname, ier)
    cg_iric_flush_f(cgnsname, fin, ier)
enddo

cg_close_f(fin)

But it is not clean. Lets add functions with more simple interface, so that the code can be like below:

cg_iric_open_f(cgnsname, CG_MODE_MODIFY, fin, ier)   ! This calls cg_iricinit_f internally

...
do
    ...
    iric_write_sol_start2_f(ier)

    iric_write_sol_end2_f(ier)
    cg_iric_flush2_f(fin, ier)
enddo

cg_iric_close_f(fin)

[kskinoue0612]

Closed with 3006556406875f9b9f0306970d8c01f3ea0281ea .