Generate documentation for parameter and return fields with tables

[RyanGlScott]

Currently, argo's autogenerated documentation for each server method includes the method's parameters and results in subsections. They look like this:

This is OK, but in my opinion, there is room for improvement. The sections for the load and clear commands are intended to have a larger font size than their Parameter fields and Return fields subsections, but the difference in size in pretty subtle. To make this more obvious, I think it would be better to format this information with RST tables, like what SAW's handwritten remote API documentation currently does. Here is what the that looks like:

With tables, it's very obvious where one method stops and another begins, and it looks nicer overall. Currently, argo doesn't support autogenerating the markdown for RST tables, but I don't imagine that it would be terribly difficult to teach argo how to do this. Here is what the markdown for the tables above look like, for reference:

Cryptol Module Management
=========================

Loading Modules
---------------

:Method name:
  ``SAW/Cryptol/load module``
:Parameters:
  - ``module name``: The name of the Cryptol module to be loaded.

Loading Files
-------------

:Method name:
  ``SAW/Cryptol/load file``
:Parameters:
  - ``file``: The name of the Cryptol source file to be loaded.