Suggestion for a --union-of-all-graphs option

[mpagni12]

Contexts AKA named graphs are critical for me to populate and update GraphDB. But, at the time of querying I completely ignore contexts. I am following a W3C recommendation which says that contexts should convey no semantics (or something like this... I lost the link). I think that a --union-of-all-graphs option would be extremely useful for the void-generator, such as all contexts be ignored at the time of collecting statistics. It should also dramatically speed-up things and simplify the output.

Marco