dot: add option 'A' to disable 'a'
This way in 2.5 we can make 'a' the default, and tell people to use SPOT_DOTDEFAULT=A if they want the old behavior in both 2.4 and 2.5. * spot/twaalgos/dot.cc: Implement the option. * NEWS, bin/common_aoutput.cc: Mention it. * tests/core/readsave.test: Test it.
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