update changelog

git-svn-id: https://svn.code.sf.net/p/vpinball/code/trunk@1029 14438d79-0ffd-4333-8ae7-ea2bdd901387
Made new nudge model configurable in the GUI.
Merge tag 'VP990' into physics
Minor cleanup to Surface collision code.
Fixed bug with joints not getting generated on some corners.