Improve gs2build and gs2runtime syncronisation with gsdl

[oranfry]

At the moment there are several files (~15) in the root of gs2build and gs2runtime, which are copies (or copies with slight modifications) of files in gsdl/trunk. If the files in gsdl change, the same change needs to be applied to the files in gs2build and gs2runtime. We could save time manually syncing these files, by setting up an automatic system to keep the files in sync.

Ideas:

• A cron job to check for changes to the gsdl files and apply them to the gs2build/gs2runtime files
• Identify the files in gs2build and gs2runtime that are exact copies of the files in gsdl/trunk and delete them from gs2build and gs2runtime, and invent another system to help get those files directly from gsdl (making the problem _smaller_)