move spot/bin/ and spot/tests/ up by one level

* spot/bin/: Move...
* bin/: ... here.
* spot/tests/: Move...
* tests/: ... here.
* Makefile.am, README, bench/stutter/Makefile.am,
bench/stutter/stutter_invariance_formulas.cc, doc/Makefile.am,
configure.ac, debian/rules, spot/Makefile.am, spot/ltsmin/Makefile.am,
spot/ltsmin/kripke.test, spot/sanity/style.test, python/tests/run.in:
Adjust.

bin/.gitignore

@@ -0,0 +1,16 @@
+autfilt
+dstar2tgba
+genltl
+ltl2tgba
+ltl2tgta
+ltlcross
+ltldo
+ltlfilt
+ltlgrind
+randaut
+randltl
+spot-x
+*.a
+*.1
+*.7
+lck-*