Issue #613: added ethnic background field to pedigree nodes; added JSON output to EthnicitySearch service
Issue #767: fixed hardcoded message in the "Welcome message content" box in "welcome message" admin section
Issue #926: - fixed incorrect canvas size resulting in weird node menu behaviour/resizing
- added import/export of person group nodes to simpleJSON format
- code cleanup
- removed velocity processing of nodeMenu.js, since servde URLs are now obtained purely in JS (should help with unwanted caching of the file as well)