swarming: add support everywhere
Swarming implies that a single instance of the kripke structure (or product) will be explored by diffrent threads with their own exploration order. Most of the modification aims to have a thread safe kripke structure. * spot/kripke/kripke.hh, spot/ltsmin/ltsmin.cc, spot/ltsmin/ltsmin.hh, spot/mc/ec.hh, spot/mc/intersect.hh, spot/mc/reachability.hh, spot/misc/hash.hh, spot/twacube/twacube.hh, tests/core/twacube.test, tests/ltsmin/modelcheck.cc: here.
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