DomCharacterData.deleteData() fixed

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@8815 5f5364db-9458-4db8-a492-e30667be6df6
XMLDocument.firstChild() is now enabled to support more nodes at the root level like ProcessingInstruction, Comment

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@8816 5f5364db-9458-4db8-a492-e30667be6df6
ups

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@8817 5f5364db-9458-4db8-a492-e30667be6df6