Add full in/out options to *ingrid* and *outgrid*

[joa-quim]

But we have a problem. As it stands grdconvert says we need to state =ID in order to access to +sscale, etc. But that's not what we have in https://gmt.soest.hawaii.edu/doc/latest/GMT_Docs.html#grid-file-format-specifications where =ID is optional.

[PaulWessel]

I agree with these changes

[joa-quim]

But have you read the comments in PR body?

[PaulWessel]

Sorry, no... What is the problem other than changing the docs to match reality?

[joa-quim]

No problem, but not sure anymore what reality is. I remember that we visited this not long ago and I think we made =ID optional but it has to be provided when read/write native binary formats, so not so optional.

[PaulWessel]

Think it says(?) optional if reading the default netCDF grid format.

[joa-quim]

The point is. Should in grdconvert we remove the part that says If =id is set (see below),?
Although true more most cases, that is a contradiction to saying that =ID is optional.

[joa-quim]

This is clearly out of scope of this (closed) PR but since I started it... The CookBook section is badly incomplete as it misses the :diver option that is used when saving grids in GeoTiff floats or JPK2.