Examples and clean-ups (#1)

- Attempt at implementing an example for DRS
- Complete reactions set
- New automaton
- Formula
- Fixed automaton scaling
- Proc index in the formula
- Benchmark generators
- Scripts to reproduce experiments for reaction mining

experiments/reaction_mining_mutex/bench_mutex_nonparam_oldimpl_time.dat

@@ -0,0 +1,20 @@
+2 0.068995
+3 0.110615
+4 0.164639
+5 0.234950
+6 0.322793
+7 0.438878
+8 0.578109
+9 0.752163
+10 0.955217
+11 1.190432
+12 1.519409
+13 1.808177
+14 2.200211
+15 2.654874
+16 3.265984
+17 3.824895
+18 4.413004
+19 5.303216
+20 6.310782
+21 7.038971