Text Series Slot Icon [1]
Bug Number: n/a
Release notes (y/n): no
For Release Nums: 7.1

A special Series Slot Icon variant has been added for the new Text Series 
Slot.  The icon has tiny letters "TXT" along the top, and a series trace 
line along the bottom.  We chose #5 (of 7) from the candidates shown on 
this webpage:

  http://cadswes2.colorado.edu/~philw/2017/Icons/TextSeriesIcons.html

Here are screenshots of the Open Object Dialog (Object Viewer) and an 
Open Slot Dialog showing this new slot type:

  http://cadswes2.colorado.edu/~philw/2017/Icons/TextSeriesInGui/OpenObj-AddTextSeriesSlot.png
  http://cadswes2.colorado.edu/~philw/2017/Icons/TextSeriesInGui/TextSerSlot-inOpenObj-OpenSlot.png

NEW DEFINITIONS:

Icon image:
  QtUtils\Images\RwQPixmap16\textSeriesSlot.png

QtUtils/RwQPixmap16:

  <file alias="textSeriesSlot.png">Images/RwQPixmap16/textSeriesSlot.png</file>
  static const QPixmap& textSeriesSlot();
  static const QIcon& textSeriesSlotIconSet();

Sim/IconHandle:

  typedef enum { ...
      SlotIcon_textSeriesSlot,       // Slot:  Text Series
      ... } IconID;

Sim/SeriesSlot (similar to existing method in Sim/RootColRef).

  bool isTextValues() const;

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