[Halld-offline] adding recon conditions information to REST files

[Richard Jones]

In the minutes of the 1-21 mtg it states:

Storing software information in REST files

Since we're storing information on the software conditions used for
reconstruction, it might be nice to store some of this information in the
"officially" created REST files themselves, for a certain amount of
self-documentation.

Mark thought that it should be possible to add a "software version" element
to the rest format, independent of the physics events, at the beginning of
the file. Paul will ask Richard Jones about how this might be done.


There is already a tag called "comment" that is present in every REST file
event. Most of these are empty, but I think the intention was to populate
the comment tag of the first event in the file will some information of
this sort. I suggest that you augment this tag and stick the extended info
there. There is no length restriction on a string attribute in hddm.

-Richard Jones
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