build-check errors

[dankelley]

I get as below. I am busy trying to fix other things (this is just a warning promoted to an error -- the package can build, it just cannot check). The following can likely be alleviated in the way I do for my other packages ... I can never remember that offhand.

* checking package dependencies ... ERROR
Namespace dependencies missing from DESCRIPTION Imports/Depends entries:
  'methods', 'oce', 'rjson'

[dankelley]

Fixed in a5d965b, which was a large change, because I wanted to remove circular dependencies (which are not allowed on CRAN, for obvious reasons) and even suggestions (again, I think a problem on CRAN).

Besides, the point is to have a separate package that can be more limber than oce.

There are likely errors and problems in the code for topo, coastline and met. I will focus on met first, because I want that today.