Insert separator in toolbar
pixelpos = lm_insertseparator(hframe, FRAMECOLOR, pixelpos, normpos, direction)
hframe: modelit.layout.Frame to print these buttons in FRAMECOLOR: background color to use pixelpos: initial pixelposition normpos: normalized position (default: [1 0]) direction: direction to plot buttons in (default: 1) 1: Left to Right, -1: Right to Left
pixelpos: element 1 of pixelpos vector (horizontal position)