Yes it is the default, because is the best integrated one to use (e17 is buggy and unstable, E22 is not customized at all)
Yes 
noted, there's also a few ones included in e16
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Yes it is the default, because is the best integrated one to use (e17 is buggy and unstable, E22 is not customized at all)
Yes noted, there's also a few ones included in e16