repro: RRDecorator, use vector::front with care

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10029 ddefafc4-47db-0310-ae44-fa13212b10f2
repro: checking for forceTarget

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10030 ddefafc4-47db-0310-ae44-fa13212b10f2
resip/stack: Modify default chunk size (inspired by change on b-webrtc)

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10036 ddefafc4-47db-0310-ae44-fa13212b10f2