* scm/fret-diagrams.scm (draw-dots): default values for dot size

	* scm/fret-diagrams.scm (draw-dots): default values for dot size
	and dot-position now depend on finger-code value; in-dot makes
	dots larger and centered.
	(draw-barre): added straight-barre indicator option
	(draw-dots): made fontify-text-white work.

	* music-drawing-routines.ps: added /draw_white_text

	* scm/output-tex.scm:  added white-text

	* scm/output-ps.scm:  added white-text

	* scm/lily.scm (ly:all-stencil-expressions): Added white-text to
	list of stencil expressions

	* scm/stencil.scm: Added fontify-text-white