Fix tutorial Google Colab links and file downloads

Author: nickbianco

Bindings/Python/tutorials/Tutorial 2 - Creating and Simulating a simple arm Model.ipynb

@@ -67,7 +67,7 @@
     "id": "mmmTuEI4HQJG"
    },
    "source": [
-    "First, set up the environment by executing the following cell (See [Tutorial 1: Introduction to OpenSim](https://drive.google.com/file/d/1P_2IRJFzdodS1-ce4BsOsC9d8xWXCqXS/view?usp=sharing))."
+    "First, set up the environment by executing the following cell (See [Tutorial 1: Introduction to OpenSim](https://colab.research.google.com/github/nickbianco/opensim-core/blob/python_examples/Bindings/Python/tutorials/Tutorial%201%20-%20Introduction%20to%20OpenSim.ipynb))."
    ]
   },
   {

Bindings/Python/tutorials/Tutorial 3 - Loading and Modifying OpenSim Models.ipynb

@@ -73,7 +73,7 @@
     "id": "mmmTuEI4HQJG"
    },
    "source": [
-    "First, set up the environment by executing the following cell (see [Tutorial 1: Introduction to OpenSim](https://drive.google.com/file/d/1P_2IRJFzdodS1-ce4BsOsC9d8xWXCqXS/view?usp=sharing) for more details)."
+    "First, set up the environment by executing the following cell (see [Tutorial 1: Introduction to OpenSim](https://colab.research.google.com/github/nickbianco/opensim-core/blob/python_examples/Bindings/Python/tutorials/Tutorial%201%20-%20Introduction%20to%20OpenSim.ipynb) for more details)."
    ]
   },
   {

Bindings/Python/tutorials/Tutorial 4 - Musculoskeletal models, Motion Files and MuscleAnalysis.ipynb

@@ -101,7 +101,7 @@
     "id": "mmmTuEI4HQJG"
    },
    "source": [
-    "First, set up the environment by executing the following cell (see [Tutorial 1: Introduction to OpenSim](https://drive.google.com/file/d/1P_2IRJFzdodS1-ce4BsOsC9d8xWXCqXS/view?usp=sharing) for more information)."
+    "First, set up the environment by executing the following cell (see [Tutorial 1: Introduction to OpenSim](https://colab.research.google.com/github/nickbianco/opensim-core/blob/python_examples/Bindings/Python/tutorials/Tutorial%201%20-%20Introduction%20to%20OpenSim.ipynb) for more information)."
    ]
   },
   {

Bindings/Python/tutorials/Tutorial 5 - Scaling, Inverse Kinematics, and Inverse Dynamics.ipynb

@@ -100,7 +100,7 @@
     "id": "mmmTuEI4HQJG"
    },
    "source": [
-    "First, set up the environment by executing the following cell (See [Tutorial 1: Introduction to OpenSim in Colab](https://drive.google.com/file/d/1P_2IRJFzdodS1-ce4BsOsC9d8xWXCqXS/view?usp=sharing) for more information)."
+    "First, set up the environment by executing the following cell (See [Tutorial 1: Introduction to OpenSim in Colab](https://colab.research.google.com/github/nickbianco/opensim-core/blob/python_examples/Bindings/Python/tutorials/Tutorial%201%20-%20Introduction%20to%20OpenSim.ipynb) for more information)."
    ]
   },
   {

Bindings/Python/tutorials/Tutorial 6 - Static Optimization.ipynb

@@ -126,7 +126,7 @@
     "id": "mmmTuEI4HQJG"
    },
    "source": [
-    "First, set up the environment by executing the following cell (See [Tutorial 1: Introduction to OpenSim](https://drive.google.com/file/d/1P_2IRJFzdodS1-ce4BsOsC9d8xWXCqXS/view?usp=sharing) for more information)."
+    "First, set up the environment by executing the following cell (See [Tutorial 1: Introduction to OpenSim](https://colab.research.google.com/github/nickbianco/opensim-core/blob/python_examples/Bindings/Python/tutorials/Tutorial%201%20-%20Introduction%20to%20OpenSim.ipynb) for more information)."
    ]
   },
   {
@@ -270,7 +270,9 @@
     "id": "bjlOR8fym2Pl"
    },
    "source": [
-    "Load the model into OpenSim. To check that the file has been downloaded correctly, let's print its name. Notice that we are getting more information printed to the console because of the Python `LogSink` that we've added. You can also see the logs in the `opensim-log.log` file that has been created."
+    "Load the model into OpenSim. To check that the file has been downloaded correctly, let's print its name. Notice that we are getting more information printed to the console because of the Python `LogSink` that we've added. You can also see the logs in the `opensim-log.log` file that has been created.\n",
+    "\n",
+    "Don't worry about logged messages similar to \"Couldn't find file 'sacrum.vtp'\"; VTP files are only used for visualization and not needed for this example."
    ]
   },
   {

Bindings/Python/tutorials/Tutorial 8 - Creating Muscle-driven Simulations with OpenSim Moco.ipynb

@@ -174,7 +174,7 @@
         "\n",
         "# Define the button click event handler\n",
         "def on_button_click(b):\n",
-        "    url = 'https://drive.google.com/uc?export=download&id=1avX8gITGgjpQUaWCZuN2U8Fd1gXApscS'\n",
+        "    url = 'https://drive.google.com/uc?export=download&id=1xnrBNTqIHQVIIxQNQEbHUmVLLRduV5jd'\n",
         "    if url:\n",
         "        download_and_extract_zip(url)\n",
         "    else:\n",