Added benchmarks for 25 % / 50 % / 75 % matched predicates (every
match() call returns the required number of predicates / subscriptions)
Renamed some of the methods, so as to make clearer what
they do
Added methods which are almost the same as timeMatch_*() methods, but
use Events which would match all Predicates if not for a single
attribute
Merge branch 'benchmark' into optimizations-backreferences