Changes to JitGraph SRF format for release

[rabanks]

Initial version of JitGraph changes for review

[JeroenDeDauw]

@rabanks Thanks for the patch, and sorry this just sat here. I noticed due to the link on the mailing list.

I had a quick look at this now and did not see anything crazy. Can't do a truly thorough review unfortunately.

To get this merged, the following needs to happen:

• Verify the code still works as expected with SRF master and SMW master.
• Update the release notes to reflect the changes relevant to the users (if any) (in particular things such as removed parameters, no longer accepted values, new options, etc)
• Get verification that things did not break from a second source, such as a user of the format that tries out the new code. (Or a thorough review of a dev)

[mwjames]

This PR has been since Dec 2, 2013, and I can hardly see any progress. Please open a new PR against the current master, if this is still being pursued.