Misc. typos

+ some are doxy others are just comment code.  
+ some minor whitespace and grammatical tweaks. 
+ app/SCL/* typos have also been submitted upstream (https://github.com/stepcode/stepcode/pull/366). So it's ok to merge them in to master.

src/Mod/PartDesign/Gui/Utils.h

@@ -74,7 +74,7 @@ void relinkToBody ( PartDesign::Feature *feature );
 
 /// Check if feature is dependent on anything except movable sketches and datums
 bool isFeatureMovable(App::DocumentObject* feature);
-/// Collect dependencies of the features during the move. Dependecies should only be dependent on origin
+/// Collect dependencies of the features during the move. Dependencies should only be dependent on origin
 std::vector<App::DocumentObject*> collectMovableDependencies(std::vector<App::DocumentObject*>& features);
 /// Relink sketches and datums to target body's origin
 void relinkToOrigin(App::DocumentObject* feature, PartDesign::Body* body);

src/Mod/PartDesign/TestPartDesignGui.py

@@ -85,7 +85,7 @@ class PartDesignGuiTestCases(unittest.TestCase):
         self.Doc = FreeCAD.newDocument("SketchGuiTest")
 
     def testRefuseToMoveSingleFeature(self):
-        FreeCAD.Console.PrintMessage('Testing refuse to move the feature with dependecies from one body to another\n')
+        FreeCAD.Console.PrintMessage('Testing refuse to move the feature with dependencies from one body to another\n')
         self.BodySource = self.Doc.addObject('PartDesign::Body','Body')
         Gui.activeView().setActiveObject('pdbody', self.BodySource)