Adding sensor boundary line width variation.
Adding sensor boundary intersection property.
Restored correct default intersection width.
Updating CHANGES.md file for pull request.
Improved intersectionWidth documentation.

Added "approximate pixel" as size description.
Merge remote-tracking branch 'origin/sensorImprovements' into silhouetteConeShading
Merge remote-tracking branch 'origin/master' into silhouetteConeShading