[Frontend] Layout and styling of Time Conductor

open #889
open #298
Fixes for mobile;
Moved popup z-index def into sass;
Datetime picker compressed for
better fit in mobile phone;
Removed hours selector from datetime
picker to enable better fit in mobile;

platform/commonUI/general/res/templates/controls/datetime-field.html

@@ -37,8 +37,7 @@
         <div mct-click-elsewhere="picker.active = false">
             <mct-control key="'datetime-picker'"
                          ng-model="pickerModel"
-                         field="'value'"
-                         options="{ hours: true }">
+                         field="'value'">
             </mct-control>
         </div>
     </mct-popup>