info_in_reset adds no functionality and should be removed

[Federico-PizarroBejarano]

Currently it is possible to set a config flag info_in_reset in the environment. If true, the info will be returned when you call env.reset(). Otherwise, it won't. I am unsure if this flag was added for some compatibility reason, but I am looking into it. If not, I think it adds unnecessary confusion since it is thus necessary to check the flag before calling env.reset (unless you just assume it is true, which is what we have been doing).