bricks: move into spot directory
* bricks/brick-assert, bricks/brick-bitlevel,
bricks/brick-hash, bricks/brick-hashset,
bricks/brick-shmem, bricks/brick-types: Rename as .. .
* spot/bricks/brick-assert, spot/bricks/brick-bitlevel,
spot/bricks/brick-hash, spot/bricks/brick-hashset,
spot/bricks/brick-shmem, spot/bricks/brick-types: ... this
* Makefile.am, README, debian/copyright,
debian/libspot-dev.install, m4/bricks.m4,
spot/Makefile.am, spot/ltsmin/spins_kripke.hh,
spot/ltsmin/spins_kripke.hxx, spot/mc/bloemen.hh
spot/mc/deadlock.hh, tests/Makefile.am,
tests/core/bricks.cc: here.
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