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_time.dat

@@ -0,0 +1,20 @@
+2 0.095321
+3 0.171177
+4 0.272130
+5 0.417800
+6 0.584877
+7 0.766862
+8 1.009195
+9 1.295766
+10 1.741482
+11 2.354580
+12 2.949242
+13 3.127326
+14 4.074318
+15 4.978959
+16 6.690042
+17 8.114637
+18 12.006410
+19 11.929118
+20 14.044730
+21 15.673520