[TD] some fixes

- the setting "Standard and Style" only affects new dimensions, thus it must be italic

- fix bug that the Property 'LockPosition' appears for dimensions -> this is an option for views and thus must be hidden for dimensions

- since tolerances are in the vast majority fractions of a millimeter/inch, set its stepsize to 0.1
(I hope I did it right in handleChangedPropertyType.)

- fix inconsistent newlines in TaskBalloon.h

- improve wording for a heading

src/Mod/TechDraw/Gui/ViewProviderDimension.cpp

@@ -65,7 +65,7 @@ ViewProviderDimension::ViewProviderDimension()
 {
     sPixmap = "TechDraw_Dimension";
 
-    static const char *group = "Dim Format";
+    static const char *group = "Dimension Format";
 
     ADD_PROPERTY_TYPE(Font, (Preferences::labelFont().c_str()),
                                               group, App::Prop_None, "The name of the font to use");