added several grid-walks

added new helper methods/classes (e.g. for heading)
new test cases
optimize the dijkstra
cleanups/refactoring
added timed-benchmarks to the log
many more...

tests/data/fp1.svg

@@ -26,17 +26,17 @@
      inkscape:pageopacity="0.0"
      inkscape:pageshadow="2"
      inkscape:zoom="5.6"
-     inkscape:cx="73.937318"
-     inkscape:cy="144.77356"
+     inkscape:cx="124.63903"
+     inkscape:cy="144.84968"
      inkscape:document-units="px"
-     inkscape:current-layer="layer3"
+     inkscape:current-layer="layer1"
      showgrid="true"
      units="px"
      inkscape:object-nodes="true"
-     inkscape:window-width="1920"
-     inkscape:window-height="1021"
-     inkscape:window-x="0"
-     inkscape:window-y="0"
+     inkscape:window-width="1600"
+     inkscape:window-height="837"
+     inkscape:window-x="-8"
+     inkscape:window-y="-8"
      inkscape:window-maximized="1">
     <inkscape:grid
        type="xygrid"
@@ -51,7 +51,7 @@
         <dc:format>image/svg+xml</dc:format>
         <dc:type
            rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
-        <dc:title></dc:title>
+        <dc:title />
       </cc:Work>
     </rdf:RDF>
   </metadata>
@@ -60,8 +60,7 @@
      inkscape:groupmode="layer"
      id="layer1"
      transform="translate(0,-796.36219)"
-     style="display:none"
-     sodipodi:insensitive="true">
+     style="display:inline">
     <path
        style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
        d="m 8,1044.3622 0,-240.00001 240,0 0,168 -128,0 0,72.00001 -112,0"
@@ -151,6 +150,11 @@
        id="path3389"
        inkscape:connector-curvature="0"
        sodipodi:nodetypes="cccc" />
+    <path
+       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="m 160,876.36219 0,24"
+       id="path3381"
+       inkscape:connector-curvature="0" />
   </g>
   <g
      inkscape:groupmode="layer"
@@ -168,8 +172,7 @@
      inkscape:groupmode="layer"
      id="layer2"
      inkscape:label="2"
-     style="display:inline"
-     sodipodi:insensitive="true">
+     style="display:none">
     <path
        style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
        d="m 112,104 40,0 0,-24 -40,0"
@@ -265,5 +268,10 @@
        d="m 72,136 144,0"
        id="path3438"
        inkscape:connector-curvature="0" />
+    <path
+       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="m 120,80 0,24"
+       id="path3379"
+       inkscape:connector-curvature="0" />
   </g>
 </svg>