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_param_time.dat

@@ -0,0 +1,20 @@
+2 0.487115
+3 0.880007
+4 1.301547
+5 2.172839
+6 2.662308
+7 3.880329
+8 4.491871
+9 6.922392
+10 8.729740
+11 10.901971
+12 13.885037
+13 18.246820
+14 21.987255
+15 28.236579
+16 41.065607
+17 44.456013
+18 50.782835
+19 59.535617
+20 83.400427
+21 96.250559