update pom parent, add .DS_Store in gitignore, update some classes

.gitignore

pom.xml

...in/java/plugins/adufour/activecontours/ActiveContour.java

...n/java/plugins/adufour/activecontours/ActiveContours.java

...plugins/adufour/activecontours/ActiveContoursOverlay.java

...a/plugins/adufour/activecontours/DeformationProfiler.java

src/main/java/plugins/adufour/activecontours/Mesh3D.java

src/main/java/plugins/adufour/activecontours/Polygon2D.java

src/main/java/plugins/adufour/activecontours/ReSampler.java

...a/plugins/adufour/activecontours/SaveMeshTracksToVTK.java

...in/java/plugins/adufour/activecontours/SlidingWindow.java

...ava/plugins/adufour/activecontours/TopologyException.java