gen: hide ks_cobuchi(), introduce aut_pattern()

* spot/gen/automata.hh, spot/gen/automata.cc: Hide ks_cobuchi() behind
introduce aut_pattern(), as we have already done for the formulas.
* bin/genaut.cc: Simplify using this interface.
* python/spot/gen.i: Introduce aut_patterns().
* tests/python/gen.ipynb, tests/python/gen.py: Adjust.

tests/python/gen.ipynb

@@ -45,7 +45,7 @@
      "language": "python",
      "metadata": {},
      "outputs": [],
-     "prompt_number": 13
+     "prompt_number": 1
     },
     {
      "cell_type": "markdown",
@@ -71,13 +71,13 @@
        ],
        "metadata": {},
        "output_type": "pyout",
-       "prompt_number": 14,
+       "prompt_number": 2,
        "text": [
         "GFp1 & GFp2 & GFp3"
        ]
       }
      ],
-     "prompt_number": 14
+     "prompt_number": 2
     },
     {
      "cell_type": "code",
@@ -94,13 +94,13 @@
        ],
        "metadata": {},
        "output_type": "pyout",
-       "prompt_number": 15,
+       "prompt_number": 3,
        "text": [
         "F(p & Xp & XXp & XXXp) & F(q & Xq & XXq & XXXq)"
        ]
       }
      ],
-     "prompt_number": 15
+     "prompt_number": 3
     },
     {
      "cell_type": "markdown",
@@ -289,7 +289,7 @@
        ]
       }
      ],
-     "prompt_number": 20
+     "prompt_number": 4
     },
     {
      "cell_type": "markdown",
@@ -304,7 +304,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "sg.ks_cobuchi(3).show('.a')"
+      "sg.aut_pattern(sg.AUT_KS_COBUCHI, 3).show('.a')"
      ],
      "language": "python",
      "metadata": {},
@@ -312,7 +312,7 @@
       {
        "metadata": {},
        "output_type": "pyout",
-       "prompt_number": 23,
+       "prompt_number": 5,
        "svg": [
         "<svg height=\"295pt\" viewBox=\"0.00 0.00 734.00 295.41\" width=\"734pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
         "<g class=\"graph\" id=\"graph0\" transform=\"scale(0.906173 0.906173) rotate(0) translate(4 322)\">\n",
@@ -491,7 +491,43 @@
        ]
       }
      ],
-     "prompt_number": 23
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "Multiple automata can be generated using the `aut_patterns()` function, which works similarly to `ltl_patterns()`."
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "for aut in sg.aut_patterns(sg.AUT_KS_COBUCHI):\n",
+      "    print(aut.num_states())"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "3\n",
+        "5\n",
+        "7\n",
+        "9\n",
+        "11\n",
+        "13\n",
+        "15\n",
+        "17\n",
+        "19\n",
+        "21\n"
+       ]
+      }
+     ],
+     "prompt_number": 6
     },
     {
      "cell_type": "code",