Add "state" method to return the current state of an experiment.
Add "info" method to return stuff that we currently get via the tbreport script. The difference is that the info is returned as hashed arrays (or arrays) instead of as a big print statement. Currently just the node mapping and link mapping functions (of tbreport) are supported. At Jay's request, purge pid/eid/gid from documentation and use/allow "proj", "exp", "group" instead. Note that pid/eid/gid are still accepted by the server (cause I won't be able to stop using them!).
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