Remove Macintosh ligatures item.  Solution:  Update your Times fonts.

Added native package semantics note.
diff --git a/Doc/TODO b/Doc/TODO
index 23aad66..672c32a 100644
--- a/Doc/TODO
+++ b/Doc/TODO
@@ -4,6 +4,6 @@
 
 * array module:  methods read(), reverse(), write() of the array object.
 
-* Fix partparse.py again, or toss it into the abyss.
+* Document native package semantics.
 
-* Figure out ligature issues for PDF on Macs.
+* Fix partparse.py again, or toss it into the abyss.