This function improves the style of lines in eps files generated by MATLAB's print function, making them more similar to those seen on screen. Grid lines are also changed from a dashed style to a dotted style, for greater differentiation from dashed lines.
The screenshot demonstrates the improvements, with the figure (top right) being printed to eps (bottom left), which is then improved (bottom right) using FIX_LINES. Note how the effect becomes more marked on thicker lines.
The function additionally moves any embedded fonts after the bounding box information, to ensure correct cropping in Ghostscript.