Update Potrace bitmap macros to upstream 1.13
Updating Potrace from 1.10 to 1.12, fixing Bug #1438366 (CVE-2013-7437 vulnerability).
Update to Potrace 1.10
Tracing. Potrace 1.9 update (see http://potrace.sourceforge.net/ChangeLog).
Update Potrace to 1.8
moving trunk for module inkscape