GadLayout 37.26:
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 - GLIM_Toggle tag added for IMAGEBUTTON_KIND gadgets.
 - New gadget tags: GL_DupeHeight, GL_AlignTop, GL_AlignBottom.
 - New function: GadgetKetCmd().

GadLayout 37.19:
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 - New gadget tags: GL_MinWidth, GL_MaxWidth, GL_MinHeight, GL_MaxHeight
   and GL_Columns.
 - New tags for LayoutGadgetsA(): GL_NoCreate, GL_BorderLeft, GL_BorderRight.
 - FreeLayoutGadgets() will now safely do nothing if passed NULL.
 - Test programme now uses WA_InnerWidth and WA_InnerHeight as it should.