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This replaces PR #263.
Adds compatibility with Qt5 to the Qt GUIs. Adds compile-time checks for the Qt version so that the correct functions or libraries are used; i.e. the GUIs are still compatible with Qt4.
Also removes some old tooltip code in egs_inprz that was not used any more, but that caused a visual bug on Windows with Qt5 (the word "toolTipTip" appeared in the centre of the GUI).
Tested on qt-4.8.6 and qt-5.10.1 on linux and qt-5.10.1 on Windows.