Rename gdp-dev to gdp-dev-c for consistency.
Clean up installation scripts and associated documentation to bring it
up to date. I've probably missed things, and this has not been
subjected to any more than cursory testing due to lack of time.
First cut on deleting old documentation and restructuring the remainder
to be easier to navigate. Several of the docs still need to be updated.
One significant change: the installed documentation is now in a