basic gradient fill for poly, but shows the scans at the moment
refactored poly fill into own class PolyFiller
cont'd pluggable fill algorithms
prepared pluggable fill algorithms
* added Suggests for Inkscape * warning if unsupported path types are used
implemented line
* merged with tools branch to get fix for bug #86
* fixed bug #86 * implemented circle and ellipse
merged with tools branch to new comment type
