[JOB] 16-08-22

Modified the source of the helpviewer package - based on Tkhtml2.
Please see code below.


****Some notes:****

   * Tkhtml3 html widget command has a different interface compared to Thktml2 and does not show command options, which makes it hard to do any development, so for the moment Tkhtml2.0 - although not actively developed any more - is still an option to choose.
   * There are various dependencies in order to run the helpviewer, which are non included here.


[WikiDbImage HelpViewer.png]

   * helpviewer.tcl
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   * helpviewer_demo.tcl
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   * main.tcl
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   * Makefile.tcl
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