FS#11129 - Make screenshots in the manual non-floating
Screenshots in the manual are nested into a 'figure' environment, but the only purpose of this is to be able to have a caption. The floating feature of 'figure' by using the placement attribute 'H' (='Here!').
This patch makes screenshots non-floating while keeping captions below the images. This is done via the LaTeX package 'caption2'.
Placement attribute for figures is set back to the LaTeX default so that figures can really float should we need it.
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