twa: make acc_ private
* spot/twa/twa.hh: Here. * spot/ta/ta.hh, spot/twa/taatgba.cc, spot/twa/taatgba.hh, spot/twa/twagraph.hh, spot/twa/twasafracomplement.cc, spot/twaalgos/stutter.cc: Adjust.
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* spot/twa/twa.hh: Here. * spot/ta/ta.hh, spot/twa/taatgba.cc, spot/twa/taatgba.hh, spot/twa/twagraph.hh, spot/twa/twasafracomplement.cc, spot/twaalgos/stutter.cc: Adjust.