added methods to TClntCfgMgr class which validate pd and prefix scopes
added validation on ia_pd prefix option from received message (advertise, reply)
Cosmetic fixes
Merge branch 'prefix_validation' of git://github.com/macfij/dibbler into macfij-prefix_validation
Couple sanity checks in Maciek's patch added.
Merge branch 'macfij-prefix_validation'
Changelog updated.