converted DOS line endings
updated bundled potrace library to version 1.11
don't build bundled potracelib if system library is used (patch by Alexis Ballier)
updated tests/Makefile.am to honor system potracelib if present
unhide derived method XMLDeclarationNode::append
allow the background color special to insert white rectancles
dropped unused variable PageRanges::_max
set version to 1.2.1
updated NEWS
Added tag 1.2.1 for changeset 99d1378bf460