Albrecht Schlosser f357f4311c Use local images in test/help_dialog(.html) ...

- create subdir test/images
- copy images used by test/help_dialog to this subdir
- fix image URL's in test/help_dialog.html accordingly

CMake: copy the entire test/images folder to the <build>/data folder

This enables the demo test/help_dialog.cxx to find its images.

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..

FL200.png

Use local images in test/help_dialog(.html)

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Fl_Value_Input.png

Use local images in test/help_dialog(.html)

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Fl_Value_Output.png

Use local images in test/help_dialog(.html)

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tiny.png

Use local images in test/help_dialog(.html)

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