get proper name of Ghostscript library when building for Cygwin
fixed a couple of broken doxygen comments
added option to create relative rather than absolute path commands
TPIC handler: use class GraphicPath to create SVG path commands
prevent throwing a DVIException when option -l is present
added slightly modified sources of clipper library (computes boolops on polygons)
added field to store the winding rule to class GraphicPath
added class PathClipper to compute intersections of closed curved graphics paths
added option --clippath to compute the intersection of clipping paths
ensure that InputReader::compare() checks whole and not just partial words
renamed GraphicPath::newpath() to GraphicPath::clear()
added evaluation of PS operator 'clippath' (copies clipping path into graphics path)
set version to 1.8
updated NEWS
Added tag 1.8 for changeset 0f6847618ddf
prevent side-effects caused by bop/eop operators present in PS specials