added common entry point to benchmarks

Demos/benchmarks/bpnn3.py

@@ -178,6 +178,8 @@ def test_bpnn(iterations):
         times.append(t)
     return times
 
+main = test_bpnn
+
 if __name__ == "__main__":
     import optparse
     parser = optparse.OptionParser(

Demos/benchmarks/generators.py

@@ -67,6 +67,8 @@ def benchmark(N):
         times.append(t)
     return times
 
+main = benchmark
+
 if __name__ == "__main__":
     import optparse
     parser = optparse.OptionParser(

Demos/benchmarks/nbody.py

@@ -138,6 +138,7 @@ def test_nbody(iterations):
         times.append(t1 - t0)
     return times
 
+main = test_nbody
 
 if __name__ == '__main__':
     parser = optparse.OptionParser(

Demos/benchmarks/nqueens.py

@@ -77,6 +77,7 @@ def test_n_queens(iterations):
         times.append(t1 - t0)
     return times
 
+main = test_n_queens
 
 if __name__ == "__main__":
     parser = optparse.OptionParser(