engelsman 2d18c6f650 Documentation on widget coordinates and layout, plus new test programs (#304) ...

Add coordinates and layout section to user manual

add section to user manual to clarify the use of window-relative
coordinates in both Fl_Group and Fl_Window containers, and include
brief descriptions of current layout manager widgets in one place.

add test/coordinates.cxx, test/wizard.cxx and related screenshots
under documentation/src.

update CMakeLists.txt, Makefile and .gitignore for new files.

Co-authored-by: Albrecht Schlosser <albrechts.fltk@online.de>

2021-12-08 15:00:33 +01:00

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