Bug 91419 patch 1:  Rename NS_FRAME_IS_SPECIAL to NS_FRAME_PART_OF_IBSPLIT.  r=mats
Bug 91419 patch 2:  Rename IsFrameSpecial to IsFramePartOfIBSplit.  r=mats
Bug 91419 patch 3:  Rename everything with IBSplitSpecialSibling to IBSplitSibling.  r=mats
Bug 91419 patch 4:  Rename everything with IBSpecialSibling to IBSplitSibling.  r=mats
Bug 91419 patch 5:  Rename everything with SpecialSibling to IBSplitSibling.  r=mats
Bug 91419 patch 6:  Rename everything with IBSplitSpecialPrevSibling to IBSplitPrevSibling.  r=mats
Bug 91419 patch 7:  Rename everything with SpecialPrevSibling to IBSplitPrevSibling.  r=mats
Bug 91419 patch 8:  Miscellaneous function and variable name changes.  r=mats
Bug 91419 patch 9:  Fix comments and debugging output referring to "special" frames.  r=mats