minor changes

@@ -11,6 +11,8 @@
 *.synctex.gz
 *.toc
 *.tikz
+*.out
+*.code
 __pycache__
 examples/codanim
 examples/out.*

-all: heap.pdf qs-partition.pdf qs-main.pdf stack-push.pdf
+all: heap.pdf qs-partition.pdf qs-main.pdf stack-push.pdf clean
 gif: qs-partition.gif qs-main.gif stack-push.gif
 mp4: qs-partition.mp4 qs-main.mp4 stack-push.mp4
 
 %.pdf: %.py tpl.tex
-	ln -sf ../codanim .
 	rm -f out.*
-	python3 $<
+	PYTHONPATH=..:$$PYTHONPATH python3 $<
 	pdflatex tpl
 	pdflatex tpl
-	cp tpl.pdf $@
+	mv -f tpl.pdf $@
 
 %.gif: %.pdf
 	rm -rf _gif