Changes to be committed:

	modified:   docs/it/vpl-bells.tex
	modified:   docs/it/vpl-colors.tex
	modified:   docs/it/vpl-count.tex
	modified:   docs/it/vpl-intro.tex
	modified:   docs/it/vpl-line.tex
	modified:   docs/it/vpl-moving.tex
	modified:   docs/it/vpl-pet.tex
	modified:   docs/it/vpl-preface.tex
	modified:   docs/it/vpl-states.tex
	modified:   docs/it/vpl-time.tex

Minor fixes (rephrasing, typos, drawing resize)