bug#47852: [PATCH 1/2 v6] gnu: Add sc-im.

[Leo Famulari]

On Thu, Nov 18, 2021 at 08:22:18PM -0500, jgart via Guix-patches via wrote:
>     * gnu/packages/spreadsheet-apps.scm: New file.
>     * gnu/local.mk (GNU_SYSTEM_MODULES): Add it.

Thanks!

I pushed as 10fad03fcf6fdd2edbdab5f939e3c0edb11a88e2 with the following
changes:

* I named the module (gnu packages spreadsheet)
* I removed some unused or duplicated module imports
* I removed the visidata module from GNU_SYSTEM_MODULES
* And I specified the licenses without a prefix, since they are not
needed in this module yet. We only need to prefix licenses when there is
a namespace collision between licenses and same-named packages, for
example with 'expat'.